Hey kids (of all ages), it's Saturday Morning Cartoon time again!
Hanna-Barbera's take on the JLA were kinda' phoning it in by the end of the Disco Decade. Although the WORLD'S GREATEST SUPERFRIENDS had a full hour time slot (albeit as the 8AM curtain-jerker), only eight half-hour episodes were made for the series. The rest was recycled from earlier Super Friends shows.
I picked this one because it features a concept that has been recurring since the DC Multiverse was established in the early 1960s, and which has been beaten like the proverbial deceased equine in recent years... Alternate versions of our superheroes who are, in fact, villains.
From October 1979.