Caillou: The Movie

Caillou: The Movie is a 2017 American animated comedy film based on the Canadian TV series Caillou.

Plot
While performing on Slewind City, music group Green Day perished when the lake's pollution dissolves their barge, following an audience revolt after frontman Billie Joe Armstrong proposes an environmental discussion. At their memorial, Grandpa foresees the destruction of the town, but only Doris takes this seriously. Later that day, Caillou dares his son Leo to skate naked to the Krusty Burger restaurant and Leo is arrested by Police Officer. Bart considers their neighbor Mr. Hinkle a better father figure after Boris refuses to take responsibility for the incident. Caillou and a new Irish friend named Christina convince the entire town to clean their lake.

Meanwhile, Caillou adopts a pig from Krusty Burger and names it "Spider Pig" (later "Harry Plopper", and simply "Plopper"), and stores the pig's feces (and some of his own) in a silo, until Doris tells him to safely dispose of the waste. Caillou intends to take his silo to the waste management plant, but after Clementine calls to tell him that Donuts has been shut down and is giving away free donuts, Homer impatiently dumps the silo straight into the lake, polluting it worse than before. Moments later, a squirrel jumps into the lake and becomes severely mutated; Hinkle (who bond after Caillou and Boris) discover the creature before the WKEQ captures it. Robert Cook, head of the WKEQ, presents five "unthinkable" options to WKEQ President Mayor of Raoche to keep the town's pollution contained; the slow-witted president, doesn't bother reading number 3 before picking it; enclosing Slewind City in a large glass WKEQ. When the police discover Caillou's silo in the lake, and his responsibility for sealing Slewind City in the dome, an angry mob advances on the Caillou' home to kill Caillou, but the family escapes the town through a sinkhole, which then destroys their house. With the WKEQ on their trail, the Caillou flee to Tokyo. On the way, Caillou tries to make some money at a carnival by riding a motorcycle around the inside of a metal cage.

After three months of futile escape attempts, Slewind City's residents finally make a dent in the dome; pointing out the damage, Cook manipulates Raoche into ordering the town's destruction. In Tokyo, the Caillou family see an advertisement starring Tom Hanks for a new Grand Canyon on the site of Slewind City; realizing the town is endangered, Doris and the children want to go back to save it, but Caillou refuses to help the people who tried to kill him. After failing to talk Caillou into it, his family eventually leave him for good. Alone, Caillou is stranded on an iceberg and floats away. Meanwhile, Doris and the children are captured by the WKEQ after a conversation of theirs is overheard by the NSA. After a mysterious Inuit shaman saves him from a polar bear, Homer has an epiphany and decides to return to Slewind City to save the town from danger.

As Caillou arrives, a helicopter lowers a small but powerful bomb down a rope through a hole in the dome. The townspeople attempt to climb the rope to escape through the still-opened hole, but Caillou slides down the rope and knocks them off along with the bomb. After reconciling with Boris, Caillou drives a motorcycle along the dome, inspired by the earlier carnival attraction. As a passenger of the motorcycle, Bart throws the bomb through the hole; seconds later it detonates, shattering the dome and freeing the town. Cook arrives personally and prepares to shoot Caillou and Boris, but Rosie knocks him out with a boulder. The town finally praises and forgives Caillou, who rides into the sun rise with Doris, whereupon the townspeople restore Slewind City to normal. As a symbol of their gratitude, the Caillou and their friends begin to rebuild the family's house.