Olympia and Otis are partners at Odd Squad, an organization run by kids that uses math and gadgets to correct peculiar problems. After stopping a giant mouse from ruining the mayor's cheese festival, they visit Delivery Debbie to fix her feet, which have turned into snails. While they are working on a solution, they are interrupted by a new rival, Weird Tom, who boasts that he is a doer instead of a thinker and "fixes" Debbie's feet using a hologram gadget. Weird Tom and his organization, Weird Team, which is staffed by adults, win over the town by solving problems faster than Odd Squad and giving everyone free t-shirts, putting Odd Squad out of business and purchasing their headquarters. Olympia and Otis discover that Weird Tom did not fix Debbie's feet and realize that he is hiding problems instead of solving them. They reunite with Ms. O and Oona and confirm their findings by reading a
bar chart from an Oddometer. The agents confront Weird Tom, who reveals that he was kicked out of Odd Squad for being too impulsive and put the organization out of business to get revenge. The agents try to tell the public the truth about Weird Tom, but he creates a video framing them for causing Debbie's oddness. While watching the video, Oona notices that Weird Tom has not been managing the population size of the "Daves", creatures who multiply to form double their original number, and that they are close to escaping headquarters and destroying the Earth. The agents break into headquarters with help from previous agents, Olive, Otto, and Oscar. Otis and Otto dance through lasers to turn off the security cameras and the others distract the adults with
coffee and
biscotti to get the Half-inator. However, Weird Tom stops the group before they are able to prevent the Daves from escaping. Ms. O devises a plan to zap all of the Daves on Earth at once from space using a converted
ice cream truck. Weird Tom agrees to help by reinstating former Odd Squad agents across the world. Otis, Olympia, Olive, and Otto travel to space in the ice cream truck. They are attacked by Daves en route but shake them off by playing music from the truck's speakers. They zap all of the Daves by reflecting the beam from the Half-inator off of agents in reflective suits and Oscar and Oona capture the final Dave. The agents fly off into outer space to celebrate. In a series of
mid-credits scenes, Oscar shows Oona secret features of the headquarters science lab, finishing with a button that ends the movie. ==Cast==