How did Captain Underpants get super powers?

Captain Underpants, the alter ego of Principal Benjamin Krupp, gains his superpowers after a group of fourth graders, George and Harold, use a hypnotic device on him. They accidentally turn him into Captain Underpants when they splash him with water, triggering his transformation. As Captain Underpants, he possesses super strength and the ability to fly, while his superhero persona is characterized by his goofy antics and a distinctive costume made of just underpants and a cape.