Captain Underpants: The First Epic Movie

George and Harold hypnotized Mr. Krupp to avoid being separated into different classes. Mr. Krupp had devised a scheme to split up the two friends once and for all, hoping to end their friendship. Desperate to stay together, the boys used a hypnotic device they found in a cereal box to transform their strict principal into Captain Underpants.

Earlier, Mr. Krupp explicitly states his plan to place George and Harold in separate classes, directly motivating their extreme solution.

The hypnosis can be broken in two ways: by splashing Captain Underpants with water or by snapping the fingers of whoever commanded him. George and Harold discover this early in the movie when they need to temporarily restore Mr. Krupp to his normal self.

The boys learn the reversal methods right after creating Captain Underpants, establishing the rule that governs his transformations throughout the film.

Professor Poopypants harbors an irrational but intense hatred of laughter, which stems from his deeply insecure nature. He believes laughter undermines authority and intelligence, making him furious when students find anything funny. His ridiculous name, a running joke in the movie, only intensifies his rage at being mocked.

His first appearance shows him aggressively demanding silence and expressing disgust at any sound of amusement from the students.

Captain Underpants gains actual superpowers from the toxic waste produced by the giant Turbo Toilet 2000. During the climactic battle, thenoxious fumes grant him genuine abilities like super strength and flight, transforming him from a hypnotically-induced persona into a truly empowered superhero.

The massive Turbo Toilet 2000 is shown producing large amounts of hazardous waste before it unleashes its attack on the school.

Mr. Krupp undergoes a transformation after George and Harold encourage him to pursue a relationship with Edith, the lunch lady. Their matchmaking efforts help him see the value in friendship and kindness. This new connection softens his grumpy exterior, and he even returns the confiscated comics to the boys as a gesture of his changed attitude.

Edith is shown being charmed by Captain Underpants earlier, hinting at the romantic connection that later develops.

The toilet army is created when the malfunctioning Turbo Toilet 2000 releases toxic waste that animates discarded toilets from a nearby scrapyard. These mischievous porcelain creatures converge on the restaurant where Mr. Krupp and Edith are dining, creating a chaotic situation that unexpectedly triggers Mr. Krupp's transformation back into Captain Underpants.

The Turbo Toilet 2000's catastrophic failure is established earlier in the film as a source of dangerous waste.

Melvin Sneedly gets caught in a massive roll of toilet paper during the chaotic battle with the Turbo Toilet 2000. While trapped, he is freed when George and Harold disrupt the device. Unlike the other students who were turned into drones, Melvin appears unharmed and returns to normal after the conflict ends.

Melvin's invention, the Turbo Toilet 2000, becomes the central weapon used by Professor Poopypants.

The hypnosis only works on Mr. Krupp because George and Harold specifically targeted him with the hypnotic device. They had no intention of hypnotizing anyone else, they only wanted to prevent their principal from separating them into different classes. The device's effect is directed at whoever the hypnotist commands.

The boys specifically state they are hypnotizing Mr. Krupp to become Captain Underpants when they use the device.