Captain Mystery

Captain Mystery was a bumbling superhero that's more of a menace than a help to the Super Friends.

History
Sidney Wannamaker is a nerdy computer geek that once accidentally hacked into the Justice League Computer. Using information he learned from the Justice League computer, he created an anti-gravity belt, and became a superhero calling himself Captain Mystery. However, he wasn't very good at being a superhero, as he was such a big bumbler that he constantly made things worse and screwed up allowing villains to escape. After an ordeal with Lex Luthor, the Super Friends finally convice Sidney to hang up his cape for good.

Appearance
SuperFriends: The Legendary Super Powers Show
 * The Mask of Mystery