After winning a practice race, Speed Racer is offered a position on a team set to race in the Grand Prix. The company who employs his father, Pops Racer, a top engineer, owns the team. However, Speed declines because Pops doesn't want him to become a pro. Meanwhile, Pops quits when his plans to improve the Mach 5 are rejected. While Pops and Speed are driving home, a gang of motorcycle racers steals their plans. Trixie, in her helicopter, runs the gang off the road and the plans are recovered. Back at the cyclist headquarters, bad guy Acey Ducey shows up and offers to get the plans for "5,000 clams." He confronts Pops but leaves empty-handed as Pops has hidden the designs on the Mach 5's windshield using invisible ink. Deciding to sell the Mach 5 so Pops can rebuild the engine, Speed visits Sparky, who suggests that Speed enter the Sword Mountain Race for a $5,000 prize. While Speed takes the Mach 5 out for a road test, "dirty driver" Duggery rams the car, causing it to blow a tire.

Speed resumes the Sword Mountain Race, neck and neck with Duggery. Ace and his gang approach from the opposite direction. Speed swerves off the road and uses his rotary saws to cut a path through the overgrown terrain. Trixie creates a temporary distraction, bombing the gang with smoke flares from her plane. At a cross-road, Duggery decides to take a "shortcut." Speed knows that the road leads to a dangerous volcano and sets out to rescue him. Meanwhile, Ace and his gang fire at Trixie. The plane plummets but Trixie escapes. At the edge of the volcano, Duggery is thrown from his car, and left dangling from a rock. Speed also ends up on a rock shelf after trying to rescue his competitor. They manage to reach safety but find that the gang surrounds the Mach 5, with Trixie taken hostage. Spritle and Chim Chim, who have hidden in the Mach 5's trunk, throw rocks at the gang while Speed, Duggery, and Trixie fight them off. Ace takes off in the Mach 5. Speed follows in hot pursuit.

Speed and Trixie drive to the shipyard where the Masked Racer's car is being unloaded for the upcoming Trans Country Race. Trixie hints to Speed that he should enter the race. He hesitantly agrees. At the Racer homestead, while watching TV, Pops learns that Speed has entered the race. He "blows a gasket" and reminisces about the loss of his oldest son, Rex, who joined a race without his permission. At the brink of victory, Rex crashed the car Pops had built. Although Rex was uninjured, Pops refused to let him drive again, citing Rex's lack of experience. Consequently, Rex vowed never to return home. Meanwhile, the Alpha Team is holding a secret conference to plot a way to win the race. Mr. Wiley tells Mr. Fixer and Alpha Team driver Zoomer Slick to "pull the dirty trick first." Determined to beat the Masked Racer, Speed sneaks out in the middle of the night and goes to the track. Despite heavy rains he is not deterred. The Masked Racer warns him to stay out of the race.

The Masked Racer takes Speed to his house. He is really Speed's older brother, Rex Racer. Speed awakens. A quick look around the room finds the Masked Racer in the shower and his mask on the chair. Speed tries on the mask and is knocked unconscious by an intruder. Outside the house, Trixie arrives and sees "the Masked Racer" seated between two men. She asks if they've seen Speed. They drive away with Spritle and Chim Chim hiding in the trunk. At Wiley's mansion, Speed's mask is removed. Fixer walks in with Spritle and Chim Chim as prisoners; Chim Chim escapes and finds Trixie. Speed and Spritle are tied up. Ultimately, the Masked Racer rescues them. On race day, the Racers watch the event on television. At the track, Spritle overhears Mr. Fixer give his thugs the order to fill the Masked Racer's radiator with gasoline. Spritle and Chim Chim switch the drums so that an Alpha Team member's car explodes. The Masked Racer's car blows a tire, but he continues on three wheels.

Speed, Spritle, and Chim Chim take the Mach 5 out for a test drive. The radio announces that Tongue Blaggard has escaped from prison. The Racers meet a girl and her grandfather whose Model T has broken down on the road. Speed offers to help, but the old man declines. Later, the Racers find the broken down Model T again. This time, the old man accepts Speed's help. While the Racers dine with the old man, the granddaughter, and his adopted children, Blaggard steals the Model T, hoping that it is the one that once belonged to the crook Light Fingers Clepto. Speed vows to recover the stolen vehicle. The old man, unashamed, tells who his father was. Trixie spots the Model T from her helicopter and brings it into Pops' garage for repairs. Before long, a line of Model T's has formed, all with engine trouble. Speed finds this peculiar and uncovers the old man's original engine, finding a secret code number etched on it by Light Fingers Clepto (the old man's father).

Speed avoids colliding with Tongue Blaggard's squad of motorcyclists. But Tiny, Blaggard's sumo bodyguard knocks him out. To save Mr. Clepto from Tiny's death-grip, Speed tells Blaggard the location of what we learn is $1 billion in gold. Speed telephones Pops and leaves Trixie a message: forget about the $650 ring as a signal for help. Guarded by Blaggard's men, Speed, in his Mach 5, heads to Misty Valley, the location of the hidden treasure. They overnight in a lodge and Speed radios for help. However, Blaggard stops him and accidentally sends the homing robot home. Meanwhile, at the Racers, Trixie, who says she was "stood up" by Speed, awakens Pops. Spritle blames the homing robot for waking him. Alarmed, Trixie rushes off to find Speed. The next morning, one of Blaggard's thugs enters the lodge with Lana, a Misty Valley native (Trixie in disguise). On the road, "Lana" and Speed escape and proceed to a village where Pops waits.

Trixie wins the position of Speed's assistant in the No Limit World Race. Before the race begins Inspector Detector and his officials search each entry looking for $50 million in stolen gold bars. The Mammoth Car enters the track. Cruncher Block gives the Inspector a tour, yielding no trace of the gold. The race begins. The Mammoth Car forces everyone off the road. Speed is suspicious. To discover the Mammoth Car's secret, he equips the homing robot with X-ray film able to penetrate metal. Unfortunately, it's shot down and returns broken. The Mammoth Car catches up to Speed and forces the Mach 5 off the road. A ramp is lowered and a squad of motorcyclists descends onto the track. Racer X appears and spritzes oil on the road, causing the cyclists to crash. Meanwhile, at the airport, Spritle and Chim Chim stow away aboard Cruncher Block's plane. Back on the track, the Mach 5 and the Mammoth Car collide and both veer off the road toward a forest.

Satisfied that the Mach 5 is forever submerged in Lake Icy Chill, the Mammoth Car drivers resume the race. Through his telescanner, Speed sees them leave as he reaches soil. Trixie sends a message in the homing robot to Inspector Detector. The stolen gold is aboard the Mammoth Car. From his plane, Cruncher Block sees the Mach 5 on the road. At the refueling station, Speed and Trixie are fired at. Escaping into a mining tunnel, they jump on top of a speeding trolley car, which crashes. Meanwhile, at the refueling station, Spritle and Chim Chim sneak out of Cruncher's plane. They, too, escape into the tunnel, which turns out to be Cruncher's headquarters. There, Speed and Trixie are tied to a trolley loaded with three tons of dynamite. Ultimately, Racer X arrives and saves them. At the next checkpoint, the Inspector searches the Mammoth Car. Again, he finds nothing. Speed reaches the checkpoint; Spritle and Chim Chim slip out to hide in the Mammoth Car.

At the racetrack, the Stunt Car Spectacular promises "action and thrills." Two contestants attempt to scale a ramp and clear a stack of cars, but fail. Daredevil driver (and member of the Car Acrobatic Team) Snake Oiler urges Speed to try. Speed, instead, challenges Snake to the upcoming Big Alpine Race. Later, Speed and Pops head toward a difficult section of the course where each driver must leap over a deep cavern without plunging into the river 1,000 feet below. At the site, the Car Acrobatic Teams demonstrates their remarkable ability, twirling in the air over the cavern. Before Speed's attempt, Racer X offers advice. At Pops' garage, Pops wishes he knew the secret behind the abilities of the Car Acrobatic automobiles. Spritle and Chim Chim overhear this and sneak away at night to spy on the team. Spritle returns with photographs detailing the special devices that make the cars fly. Before long, the Mach 5 is outfitted with wings. Pops passes out from exhaustion.

Speed is competing in the Big Alpine Race. At a checkpoint, an official warns Speed of impending bad weather. Meanwhile, fearful that the Mach 5's brakes will fail, Sparky, Spritle and Chim Chim set out to reach Speed with new brakes. Something "goes wrong" with Sparky's car. Luckily, Trixie rescues them in her helicopter. On an icy road, Speed tries to pull ahead of the Car Acrobatic Team. The team thwarts Speed's attempt by knocking down icicles. Rounding an icy curve, the Mach 5's brakes fail. The car spins out of control and slides down the mountainside. Speed radios Trixie for help. The next morning, Speed catches up to Snake Oiler, whose car, along with others, is stopped at the most treacherous part of the course. Because of heavy rains, any car attempting to jump over the cavern would be sure to cause a landslide. The drivers decide to draw lots. Speed jumps and joins the wreckage below.

It is the second day of the Big Alpine Race and no one has been able to cross the chasm except for Racer X. In a nearby lodge, Trixie, Sparky, Spritle, and Chim Chim await the passage of the storm. Two drivers deliver the news of what happened at the pass. Trixie and the gang leave in her helicopter to rescue Speed. The next morning, Speed regains consciousness, discovering that he is unable to see. Somehow, he finds the Mach 5 and starts its engine. Snake Oiler cruises by "on his way to victory." Using his acute sense of hearing, Speed follows the sound of Racer X's car, which leads him back onto the racecourse. However, the Mach 5's wheels get stuck and Racer X leaves him behind. What goes around, comes around: Racer X crashes, his legs apparently broken. Speed finds him and, together as a team in the Mach 5, they plan to overtake Snake and win the race.

While out on a practice race, Speed is almost run off the track by a mysterious black car. Later that night, the black car gains on an automobile whose driver recognizes it as the X3. Before causing the auto to crash, the black car broadcasts, "Melange still races." A second car is also caused to crash. The next day, Inspector Detector asks for Speed's help. While Spritle and Chim Chim hide in the Mach 5's trunk with a tape recorder, a chase ensues, but the X3 outdistances Speed. Spritle produces a tape recording of the X3's message. Pops explains that the recent victims were the coaches of the Three Roses Club race team, the expected victors of the Danger Pass Race. However, they were worried Slash Market driving car number X3, the Melange, might beat them. Mysteriously, the Melange crashed. Pops recalls that Slash had two children – Slash Jr. and Lilly. The Inspector, Speed, and Trixie pay the siblings a visit and learn that they know nothing.

With Lilly passed out at the wheel, Speed realizes that Slash Jr. is driving the Melange via remote control. Unable to overtake it, Speed pulls over and discovers that Trixie has stowed away. Up ahead, the Melange approaches the Three Roses Club cars. Trixie sends a message in the homing robot that car number 3 is really the X3 Melange. Meanwhile, the Melange causes two of the Club cars to crash. Speed takes a shortcut over the mountain. He intersects the remaining Club car and the Melange car. Slash Jr. follows overhead, shooting at Speed. The sound of the gunfire, coupled with the thunder of the helicopter, causes an avalanche. Speed and Trixie climb to safety. Meanwhile, Inspector Detector, Pops, and a convoy of police officials head out to capture Slash Jr. Speed catches up to the driverless Melange. While Trixie takes over the Mach 5's steering wheel, Speed jumps into the Melange. Unfortunately, Speed is too late, and the Melange collides with the third Club car.

Speed, along with Trixie, Sparky, and the Mach 5 are on their way to Sandoland to compete in the Desert Race. Kim Jugger tells Speed that "he doesn't have a chance of winning." He orders the workmen to load his car, the Black Tiger, first. Spritle and Chim Chim disguise themselves and board the plane. After frightening the stewardess, they escape into the cargo area. A one-eyed man enters and the two youngsters see him plant a time bomb in Kim's racecar. Upon landing, the Black Tiger explodes. Kim accuses Speed of ordering his brother to sabotage his car. Speed denies the accusation and a fight ensues. At the hotel, Spritle tells Speed what happened in the airplane. Determined to prove his innocence, Speed and Trixie head out to Flathill Country, Kim's homeland. After surviving a sandstorm, the Mach 5 is surrounded by rebel soldiers. Unfortunately, the Mach 5 crashes when it autojacks over a sand dune.

While the Flathill Army soldiers set the Mach 5 aflame, Speed attacks one of the rebels. The General announces that he ordered Ali Ben Schemer, his cousin, to blow up his son's racecar because they need his help in the revolution. When Kim notes that his special brakes can never be repaired, Schemer suggests that Kim and Speed race without brakes. The next morning, Schemer gives them a sack lunch and the race begins. He then takes Trixie, Spritle, and the General prisoner. Chim Chim rescues Spritle and they escape on a camel. Meanwhile, as the Black Tiger and the Mach 5 race through the desert, the sack "lunches" open revealing deadly scorpions. Kim realizes what Schemer is up to. The scorpions are smashed; the race resumes. Later, members of the Flathill Government Army, who are after the rebels, rescue Spritle and Chim Chim. Back on the racecourse, the Black Tiger is devoured by quicksand. Kim, Speed, and the Mach 5 almost meet the same fate.

At the meeting of the League of Countries, the representative from Kapecapek announces his government's decision to close its borders to the outside world. An official proposes that if Kapecapek's racecar driver, named Kabala, beats Speed Racer, then its borders can remain closed. At the racetrack, Speed receives an invitation to the Fire Festival Race. Speed finds this peculiar because Kapecapek doesn't have a racetrack and Kabala has been missing for a long time. Nevertheless, Speed and company arrive in Kapecapek. They spot Racer X, who was also invited. That night Chief Zuma lets it be known that "the winner of the race will be bridegroom" to his granddaughter, Princess Sibana. He points out Speed as the probably winner. But when a jealous Trixie makes it clear that Speed is taken, another driver, Mr. Kadar, steps forward with his offer of matrimony. Later, Mr. Kadar captures the Princess and demands to know where the country's treasure is hidden. Speed comes to her rescue.

In the volcanic mountains of Kapecapek, Speed is competing in the most unusual race of his life. Kadar and his men find diamonds encrusted in the mountain wall. A creeping vine grabs his men (who escape), while Kadar holds Kabala at gunpoint. Speed throws a knife knocking the gun out of Kadar's hand. A fight ensues and Kabala's mask falls off, revealing Racer X. Racer X is about to give Speed an explanation when the ground caves in. Kadar and his thugs leave with the Kapecapekian treasure. Speed and Racer X find a way out. Racer X tells Speed that the real Kabala taught him "tricks on how to race on tortured roads and broken trails." Once Racer X turned professional, he had a race with his mentor, who, unfortunately, fell victim to a landslide. To return Kabala's kindness, Racer X disguised himself as Kabala to protect the Kapecapekian treasure. Kadar and his men succumb to the lava flow. Speed, followed by Racer X, exits the mountain just as it erupts and seals the split.

At the base of a tall building, Speed and company watch Twinkle Banks, star of the Universal Circus, dive off the top. Then, at the circus, they watch Twinkle drive a racecar and perform daredevil stunts. She worries about maintaining the car's momentum and faints. Speed rescues Twinkle. While the girl daredevil rests in bed, a clown (her father) tells Speed that because of a money shortage, he's having difficulty keeping the track in good repair. Speed makes a donation. Later, Speed and Trixie learn on the radio that Twinkle will drive a car, balanced on two ropes, over Niagara Falls. Because of the strong winds Speed and Trixie try to stop Twinkle. Meanwhile, Cornpone Brush, who financed the stunt, tells the clown that Twinkle will perform regardless of the hazardous weather. When Speed and Trixie arrive, Twinkle is already making her way across the Falls. Away from the crowd, Brush reads an old map. It identifies a secret cave in back of the Falls that leads to treasure.

Speed and Twinkle awake back into consciousness. They enter the cave behind the Falls. Cornpone Brotch (identified as Cornpone Brush in the previous episode) and his thugs arrive with the treasure. Speed fights off the thugs, while Brotch escapes in the Mach 5. Using her experience as an escape artist, Twinkle frees herself and Speed from the ropes that bind them. Trixie, in her helicopter, along with Spritle and Chim Chim, spots Brotch in the Mach 5. Speed and Twinkle exit the cave; Trixie picks them up. Brotch enters his secret hideout located in Mount Rushmore. Later that night, Speed and the gang find the secret entrance. Inside the mountain, Speed and company find collections of stolen art and cars, including the Mach 5. Brotch surrounds them with ferocious black panthers. While Speed fights the cats, Twinkle jumps to safety, hanging from a chandelier. Meanwhile, Trixie races in the Mach 5 to save her friends. Brotch locks them all in the room.

At midnight in a cemetery, the GRX racecar engine is unearthed. The following day Spritle and Chim are trapped inside a truck. It takes them to Oriana Flub's house, where Chim Chim is tied to a motorized go-cart. When the chimp comes to a stop, one of Oriana's men sprays a "formula" at him. As he takes off again, Oriana announces that "they'll win the Grand Prix of the Orient." At the track, a new racecar comes on the scene. Pops recognizes the sound of its engine. High in the stands, Oriana and her right-hand man, Omar watch while a thug sprays the driver of the mysterious car with the formula. At Oriana's house, Pops accuses her of stealing the engine ""out of the tomb of Bent Cranium,"" the engine's inventor. Pops adds that five test drivers and Cranium died because of the GRX. Oriana knocks him out with "sleeper gas." Meanwhile, Speed in the Mach 5, along with Trixie and Sparky, follows a flatbed truck carrying the GRX race car.

Speed has passed out behind the wheel of the GRX. Eventually, the car comes to a half at the edge of an aqueduct. Spritle and Chim Chim drag Speed out of the racecar. One of Oriana's thugs gets in the GRX and drives away. At the Racer homestead Pops sets out to ""cure"" Speed of his delusions. Later at the racetrack, the final trials for the Oriental Grand Prix are about to begin. Oriana's thug squirts the formula at Louis Towcar so that he can ""stand the speed of the GRX."" Further, he warns the driver that if he drinks water while he is driving, ""you'll get so scared, you'll lose control of the car and smash into smithereens. The race begins. Towcar tries to quench his insatiable thirst. A chemical reaction takes effect and Towcar passes out. Speed autojacks over the GRX, which blows up. Later, in her helicopter, Oriana asks Speed to drive the GRX in the upcoming race. Speed gets into the repaired GRX racecar. The thug gives him the formula. He takes off. Upon spotting Spee

The scene is one of the most secret secret places in the world, the secret National Science Institute. Professor Tower leaves late that night. He seems in very good spirits. The guards deduce that the professor has finished his latest invention, a new powerful ray called the Mesmo. Just then, the Mach Five approaches at high speed and jumps the gate. The alarm sounds, but not before the armed burglar can steal some important documents. The next day, at the Racer home, Spritle is working on a model of the Mach Five in the garage. Speed wakes up after a late night out. He turns on the television, and the news is reporting the burglary at the secret National Science Institute. Spritle takes his car out for a test drive. He pushes a button marked ""A"" on the steering wheel. The jacks extend on only one side. He then tries the other button marked ""B"" and only some of the grip tires deploy. A wheel comes off and the car crashes. Spritle lands at the feet of a cop who threatens to give him a t

Speed realizes that Cumulus isn't going to keep missing forever. He uses the autojacks and beats feet out of there with Cumulus in hot pursuit. With a clever ruse, Speed manages to destroy the Mesmo gun with the homing robot. Cumulus takes off with Speed chasing. The Cumulus 5 takes flight. Overhead, Inspector Detector is watching the fun below. Spritle and Chim Chim have stowed aboard. The Cumulus 5 dives into the water. Speed follows. He uses his nightshades to see in the dark. Cumulus heads into an underground cave. Deep in the cave, a steel door slams shut behind Cumulus and Speed crashes into it. He has less than half a tank of oxygen left. Inspector Detector is searching for the Mach Five on a rescue vessel. Spritle and Chim Chim have stowed aboard again. The inspector orders his men to catch the two and lock them in a cabin. After eluding the police, Spritle and Chim Chim don a diving suit. Chim Chim is the head, so when they meet the inspector, he sees through the disguise. Spr

This episode starts with Speed and Pops putting the finishing touches on a mini racer which the Kingdom of Sakkarin asked Pops to build for the Baby Grand Prix. The race will be held in celebration of the coronation of Prince Jam. Spritle wants to race in the Baby Grand Prix. He can't because the race is for 8 to 13 year olds, and he's only 7 years, 11 months, 23 days and 8 hours. To make matters worse, there won't be enough room to take him on the trip. This time, Speed flies on a 727 with some very large portholes. On the drive through Sakkarin, one of the suitcases falls off the trailer. Inside are Spritle and Chim Chim. Their first encounter is with a snake charmer's cobra. The palace in Sakkarin bears a striking resemblance to the Taj Mahal. Pops, when addressing the king, sounds so formal that he sounds ridiculous. He even addresses the king as, ""your royal highness majesty."" Trixie mistakes a really goofy looking royal person for Prince Jam, but it is really his cousin Prince Su

Spritle and Chim Chim land in the river below. The palace guards stand high above calling for Prince Jam. Minister Offendem convinces the king to have Pops and company arrested for building a defective racing car. With Prince Jam unaccounted for, the king agrees that Prince Sugarin will be the successor to the throne. Offendem hardly disguises his pleasure. Pops and Trixie have been arrested. As they are being led away, Offendem asks about Speed. The guards say that he got away before he could be arrested. Back at the river, Chim Chim revives Spritle by pouring water on his face. Speed is up in a tree draped over a branch. Spritle tries to wake him by honking the Mach Five's horn and Chim Chim jumps on the branch. Speed falls to the ground. Spritle admits to Speed that he's not the prince. Speed realizes that the real prince is locked up in the hotel room. The prince is out on the streets trying to get some food. No one will believe his royal lineage, however. When he claims to be the