And as a raven shouts defiance, the call goes out for the mightiest heroes of all! ... so how did these five guys wind up being the ones to answer it?? A break-out success for Ralph Bakshi in the 1960s, the Mighty Heroes were a bunch of cartoon cut-ups who wouldn't make the cut for the Great Lakes Avengers! It's up and away with this formative superhero parody that has some issues but still somehow holds up.