With the help of The Big O and two Australian agents, the Mobile Unit must head ,Down Under, to stop ,The Shadow, from causing world-wide oddness. Curriculum: Patterns and Coordinate Mapping

Agent Opal and Agent Omar are tired of their post at the Arctic Odd Squad Headquarters, because nothing odd ever happens there. Luckily, Opal thinks she may have uncovered the location of a legendary Odd Artifact: a 44-leaf clover. The only problem is, villains are also hot on its trail. In the wrong hands, the clover could cause worldwide, catastrophic oddness! With the help of fellow agents, Opal and Omar must find and save the 44-leaf clover before it's too late. Curriculum: Measurement, Simple Machines

When the mysterious masked villain, "The Shadow", takes over the Mobile Unit van's computer, the team must act fast to regain control of the van before it drives into The Lake of Goo. While Opal attempts to get to the van's main computer room to re-boot it, the others learn about different types of friction and how they can help slow down a moving object (in this case, the van).

On the way to deliver a baby blob to The Big O in London, England, the Mobile Unit van runs out of fuel. The team must refuel quickly and get underway before the baby blob's big brother completely blobs London as it searches for its little brother. Problem is, the van runs on water, and they're stranded in the desert. Curriculum: Liquid Measurement, Porous vs. Non-Porous

The Mobile Unit is called to Pinehurst, North Carolina to stop a villain who is stealing various objects. If they don't catch the villain in time, the local Odd Squad will be forced to cancel their annual mini golf tournament. But the Mobile Unit is having trouble figuring out who the villain is, because they don't know what the stolen objects share in common.

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The Mobile Unit's first case is all the way across the world in Japan. Orla is disappointed when the task is super simple: return a plant to the 17th dimension. All it requires is putting together a build-it-yourself portal. But when Orla rushes through constructing the portal without reading the instructions, Omar, Oswald, and Opal end up stuck in the 17th dimension. Oswald finally lands an interview on a famous Odd Squad podcast to talk about the new Mobile Unit van. But he is only familiar with the main floor of the van and hasn't yet ventured into any of the other 87 floors, including those below ground level. In his attempt to learn more about the van, Oswald gets lost and risks missing his interview altogether.

Omar has great plans to surprise Orla with a 500th birthday party. But due to some intense Odd Squad history, normal party gifts aren't going to fare well with her. So, while Opal keeps Orla busy with a string of false villain leads, Oswald and Omar must track down the ideal birthday presents. While solving oddness on a farm, the team meets a kid named Jeremy, who is their biggest fan. Opal really wants to shine in front of him, but the team accidentally gets locked out of their van. While half of the Mobile Unit distracts Jeremy, the other half tries to answer the van's security questions using math in order to get back inside.

When the Mobile Unit gets ranked low on the Odd Squad Magazine progress reports, Opal and Orla kick into competitive mode and try to solve as much oddness as possible. Meanwhile, Omar and Oswald visit the Chief of Graph at the Odd Squad Graphing Headquarters in hope of figuring out a safer solution. The Mobile Unit gets called back to the Museum of Natural Odd when Oswald's replacement, Ortho, has gone radio silent. But when they arrive and find out an ancient stone warrior has been let loose, they must de-code Ortho's strange numbering system to capture the stone warrior and save the museum.

When the members of the Mobile Unit get zapped into sandwiches by the villain, Shelly Catessan, The Big O comes to the rescue. As she combs through video footage taken by Omar to celebrate their 100th case, The Big O must use clues she sees in the videos to figure out the order in which the agents were zapped so she can return them to their agent form. Curriculum: Time - Order of Events The Mobile Unit faces a series of challenges that Orla knew was coming from overhearing a sorcerer's conversation 450 years ago. Through flashbacks, Orla shows the rest of the team the times she prepared each of them-unbeknownst to them-for the upcoming challenges. Curriculum: Calendar

Orla is kicked off the squad when a library book she took out 400 years ago is overdue. The Mobile Unit must use budgeting to turn their $1 into $10 to pay the late fee, or else Orla will not get her badge back. There's a villain turning train cars odd, and the Mobile Unit must figure out the pattern in which the villain is striking. Oswald takes it upon himself to solve the train mystery just like his favorite book character: Detective Shmumbers.

A new villain named Mr. Unpredictable calls out the Mobile Unit to try and solve his pattern, which he claims is actually not a pattern at all! Opal can't believe a villain can work without a pattern, but when the team keeps being blindsided, she starts to question herself. Meanwhile, the others take a tour of Villain University to see if they can gather any information about one of its alumni, who just happens to be Mr. Unpredictable. When the tube system is shut down due to a scrambler installed by a villain, the Mobile Unit van becomes a taxi service for other Odd Squad agents. Once they realize their service will be rated on a scale up to 10 stars, Omar and Opal dedicate themselves to giving the coolest van experience. Meanwhile, Orla rides the tubes for the first time as she and Oswald attempt to figure out where the wires are getting crossed.

Evil Sculptor approaches the Mobile Unit, because he wants to leave the Villain Network, and offers to give them top-secret villain info. The team must bring him 16-and-a-half blocks away to meet The Big O at a safe house and enter the villain protection program. The problem is, the other villains have caught wind of his defection and won't let him go so easily. Curriculum: Mapping Using the tip from Evil Sculptor, the Mobile Unit goes undercover as villains to catch the leader of the Villain Network. But first, they must go through a series of tests to prove they really are villains. Curriculum: Deductive Reasoning

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When Orla is accidentally responsible for breaking up the band Soundcheck, the Mobile Unit team must use Venn diagrams in order to convince the band members that they have things in common and reunite. On top of that, the Mobile Unit must make sure a villainous rival band doesn't hypnotize people with their music. To do that, they have to learn how sound works.

When the villain, Confetti Betty, strikes the Odd Squad headquarters in the Arctic, the Mobile Unit returns to help Opal and Omar's old squad. As they attempt to crack the villain's pattern, they must teach the Arctic agents how to solve cases for themselves so that they don't keep getting called back to help. Curriculum: Addition Patterns, Force and Friction

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An Odd Squad gadget has been stolen and is being kept in a warehouse run by robots, forcing Oswald to go undercover as a robot to get it back. Since the gadget is being stored in a room only accessible by actual robots, the team must take control of a robot and use coding to program it to retrieve the stolen gadget. Curriculum: Coding The Mobile Unit learns how things might have been if they hadn't joined the team by using "What-Would-It-Have-Been-Like-Inator" helmets. Curriculum: Addition and Doubling

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Agent Opal and Agent Omar are tired of their post at the Arctic Odd Squad Headquarters, because nothing odd ever happens there. Luckily, Opal thinks she may have uncovered the location of a legendary Odd Artifact: a 44-leaf clover. The only problem is, villains are also hot on its trail. In the wrong hands, the clover could cause worldwide, catastrophic oddness! With the help of fellow agents, Opal and Omar must find and save the 44-leaf clover before it's too late. Curriculum: Measurement, Simple Machines

The Mobile Unit is sent to New York City to fill in for the local Odd Squad agents, who are on strike because they don't like what's being served for lunch. It's up to Opal and Oswald to figure out what they would like to eat. Meanwhile, Orla and Omar must venture out into the city to solve oddness, and see the sights along the way. Agent-in-training Orpita decides to do her agent profile report on Omar, who is on creature duty, while the rest of the Mobile Unit goes out to defeat a giant robot. But when Orpita turns out to be too laidback, Omar must use fractions to feed the creature properly before it grows too big and escapes.