"The Wild Cards" happen to be the first animated incarnation of the Royal Flush Gang, a classic opponent of the Justice League. In this episode of Super Powers Team: Galactic Guardians, the Gang is aligned with Darkseid, but it's who's behind the mask of Ace that is a real stunner.
Edit, 1/16/19: Dailymotion has deleted the video due to a copyright claim from an international rights holder that isn't Warner Bros.. If/when it returns, we'll bring it back.
Amazingly, this would be the first and only time the Joker would be included in the Super Friends franchise's 13 year history. Not the best use of the Clown Prince of Crime, I'll submit, and the later usage of the Royal Flush Gang, as well as Joker, would bear that out.