CatDog (1998)

S1E16 Pumped

Fed up with the constant bullying from the Greasers, Cat stumbles upon an advertisement in a magazine for energy-boosting drinks and decides to give them a try. Although he finds the taste unpleasant, Dog absolutely loves it. As Dog becomes increasingly energized, Cat suddenly realizes that he has lost control of the situation. Instead of seeking a simple revenge on the Greasers, Dog is now out for something much more extreme. Cat pleads with him, insisting, "This isn't who you really are."