The Mobile Unit is called to investigate an odd tunnel that some (but not all) agents have disappeared into. When Omar insists they drive the van through the tunnel, he ends up stuck in a white void all alone. By collecting and comparing data, Omar must figure how to escape. When Omar catches a case of Clown-i-tosis, Orla must keep track of him in the van before he runs off to join the circus.

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.

The Mobile Unit is called to Odd Squad's Top-Secret Security Facility where an unknown villain has broken in to get to the mega-computer. But when Lady Bread, Wheelie Dan, and the Utensiler all claim to be the villain responsible, the team must recreate the break-in to discover the true culprit. "The Shadow" hosts a meeting of villains worldwide in order to convince them to join her Villain Network. But when she shows them their decline in villainy on a line graph, it catapults the villains into a game of blame. She must come up with a line graph that will convince them all to join, or her master plan will fail.

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.

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

Orla shares the story of how she was chosen to protect the 44-leaf clover in order to stop the villain, Jellybean Joe, from causing oddness to the Mobile Unit van. Curriculum: Measurement - Weight / Density When Odd Squad maintenance and kitchen workers Oxley and Olanda discover the Mobile Unit has been trapped in a snow globe by the villain, Sue Venir, they try their hands at being agents, setting out to stop Sue and save the team. This unlikely duo uses prediction and probability to figure out where the villain will most likely strike next in order to stop her. Curriculum: Prediction and Probability

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

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

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

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Jamie Jam and Marty Marmalade are always stopped by Odd Squad! Determined to help other villains avoid getting caught, they team up to trade tips.

Globetrotting villain Stu Venir is turning monuments into keychains! Agents must uncover a pattern to predict where he will strike next.

It’s Oswald’s birthday! After running into a Party Crasher creature, there are suddenly four of him who seem identical.

The Odd Squad Timekeeper keeps time for all of the clocks around the world. When she’s suddenly struck with oddness, the clocks stop working.

Orla thought she was the only ancient Agent left. However, when a distress call comes through, it becomes clear that she was wrong.

Now that ancient Agent Olando has completed retraining, he is ready to go out into the field with the Mobile Unit.

In this two-part season finale, the Odd Squad Mobile Unit must stop a group of villains who want to break into Odd Squad Headquarters to steal an ancient artifact. Little do the Agents know, their greatest challenge will come from someone inside!

In this two-part season finale, the Odd Squad Mobile Unit must stop a group of villains who want to break into Odd Squad Headquarters to steal an ancient artifact. Little do the Agents know, their greatest challenge will come from someone inside!

With a creature on the loose, and Captain O unable to help, Ozzie and Orli must work together to capture it and save HQ.