Hurtling through space, headed who knows where in a rocket they have no idea how to maneuver, Bobby, Skeeter, Nina and Nicole wind up crash-landing on a giant purple planet called Tunica. They're greeted by the Tunican ""Minister of Hellos and How Are Yous,"" who seems friendly enough--at first.

Bobby, Skeeter and Nina, along with their new friend and neighbor, Nicole, visit a space academy in Florida. Skeeter spends his time tormenting the commanding officer and flirting with Nicole. In his boldest attempt to impress Nicole, Skeeter sneaks the kids onto a space shuttle and accidentally launches it.

Skeeter, Bobby and Nina join Kenan & Kel on a dude ranch vacation. When they discover a treasure map the owner of the dude ranch traps Nina and Kel in a hole and steals their map.

Skeeter and Kenan save Kel and Nina and capture the evil dude ranch owner, but mistakenly burn the treasure map. Despite losing their chance at fortune, everyone's happy to return home in one piece.

When Nina and Bobby's bikes are stolen, the kids take it upon themselves to capture the thieves. They soon discover a chop-shop where the bikes are being broken down and sold for parts. Skeeter and Bobby are discovered by the ring of thieves and narrowly escape. In the end, the trail leads back to the owner of the local bike shop, who is prosecuted--and Nina and Bobby's bikes are returned.

With Skeeter as his campaign manager, Bobby's run for school president is all flash and no substance. Nina is so disgusted she decides to run for office herself. Despite Skeeter's efforts to sabotage her campaign, Nina wins by one vote--Bobby's.

Skeeter, Bobby and Nina must learn the lessons of parenting.

With Bobby convinced he lacks the right qualities to get into student government, Skeeter teaches him how to be "cool," but ends up turning him into a monster. Bobby is rejected by the student government club, but learns a valuable lesson about being himself.

When Bobby can't get any students to read his school paper, Skeeter becomes his "assistant" editor, turning the paper into a tabloid. When Bobby and Skeeter's fabrications are discovered, they're forced to repair the damage they've caused.

Skeeter and Bobby ditch school to attend a Yankee game. When Vanessa finds out, the only way they can escape punishment is to get a ball autographed by pitcher Tom Glavine, Andre's favorite player.

A new girl in school catches the eye of both Bobby and Skeeter. Nina, recognizing that the new girl isn't as sweet or gracious as she pretends, sets a trap that reveals the truth, not just to Bobby and Skeeter, but to the whole school.

On a class outing, the bus driver passes out and Bobby and Skeeter are forced to bring a speeding bus in safely--but not without a dramatic helicopter rescue.

On a Walker family camping trip, Skeeter blows out the generator and the car battery, forcing everyone to rough it. When a bear invades their camp, Bobby inadvertently saves the day.

When Skeeter gets a pimple on the eve of a big date, he tries everything from acupuncture to martial arts to get rid of it. Though his pimple pops in time for the date, Skeeter learns about the limits of his own vanity.

Bobby, Skeeter and Nina discover a baby pig being treated inhumanely as a mascot at a store. They kidnap the pig in hopes of giving him a better life, but are caught and brought to court. Ultimately, the pig's living conditions are improved, and the kids receive visitation rights.

Bobby gets a chain letter and doesn't answer it and becomes a victim of bad luck.

Skeeter inadvertently injures Andre just before an important father/son bowling tournament that Bobby and Andre were determined to win. Skeeter dresses up as Bobby's father in an attempt to undo the damage he's done, but only makes everything worse--much worse.

Vanessa sends Bobby, Skeeter and Nina to pick up her grandmother at the train station, along with strict rules on how to handle her. Grandma thwarts Vanessa's boring plans, and ditches the kids, who go on a frantic search for her all over the city. They finally find her at a reunion of her old dance troupe, and Skeeter fills in as her dance partner. Ultimately, Vanessa learns not to be overly protective of her grandmother.

Skeeter renounces his April Fool's Day pranks when he's visited by the ghost of his conscience. He learns that though he may enjoy playing practical jokes, his victims are not always having fun.

At a school fundraising car wash, Bobby, Nina and Skeeter wreck Nina's dad's prized Cadillac. It takes all of their car wash earnings to get the Cadillac fixed, but Nina's dad is so impressed with the results, he matches their profits.

Skeeter, pretending to be a girl, gets into a popular all-female singing group. When Andre discovers his masquerade, Skeeter must choose between success as an impostor, or making it as himself.

Skeeter and Andre, determined to get in shape for a family photograph, force the rest of the family into a grueling exercise regimen. Bobby and Vanessa dupe Andre and Skeeter into thinking they're actually in shape and ultimately help them realize they're fine the way they are.

Bobby, Skeeter, Nina and Nicole learn of a Tunican plot to take over earth by replacing every teenager on it with a Tunican clone. Skeeter's personality gets the kids out of jail and into a battle with the evil Tunicans. Eventually, everybody makes it safely back to earth, but nobody believes Skeeter when he brags about his interplanetary adventures.