Watched this cartoon when I was 7 and knew instantly that I am into extreme muscle growth. Totally Spies, S03E10, "The Incredible Bulk". Bodybuilders eating super-anabolic protein bars that turn them into giant muscle mutants.
Well you ready little man… you seem like you have some potential… you’ll probably grow bigger than us… we’ve found our muscle god bro, get him prepped for our muscle milk, he’s gotta take every drop to grow strong…mmm get ready little man… you’re gonna be massive