Totally Spies! (2001) : 4x10

Following a humiliation in the lunchroom, Arnold is left depressed. That night, as they watch someone breaking into an armoured van, Arnold dressed as a superhero appears, and attempts to capture the man. The van seals, and drives off a cliff. Sam, Clover, and Alex save Arnold beforehand, and make him swear to keep their identities secret. Geraldine Husk appears after the spies leave, and gives Arnold a utility belt. The next day, Arnold's superhero alter ego has been reported saving people, but the device is secretly brainwashing Arnold to destroy the spies. In a b story, Alex finds a stray puppy, and looks after him, as she attempts to find the owner. Villain: Geraldine Husk.