Crisis of Infinite Episodes - The Wild Cards

After over a decade the Joker's rights issues were resolved allowing him this single appearance in the Super Friends / Powers franchise... which really is a good thing since the series would have felt just a tad incomplete without one of DC's most iconic villains. Fitting also is the association of the Joker with the Royal Flush gang. I may be wrong but I don't think Joker was ever a member of the gang in the comics and so this was a pretty clever story point (there was a sometimes member named Wild Card in the comics who was actually GL villain Hector Hammond, but we are getting way off track). A little less expected was the relationship between the Joker and Darkseid... not exactly a match made in heaven, nor was it really needed.

Onscreen History of The Royal Flush Gang

Over the years, the Royal Flush Gang has proven a "royal pain" to the Justice League. First appearing in Justice League of America #43 as Clubs, the five-member gang's gimmick was a playing card theme with team members Ten, Jack, Queen, King, and Ace - though the suit and team powers changed depending on the incarnation. Over the years, the team has appropriately had affiliations with the Joker.