The Joker was an ongoing comic book series published by DC Comics from 1975 to 1976, starring, appropriately enough, Batman's archenemy The Joker. Though the series only lasted nine issues, it was significant in that it was the first series to star a member of Batman's famed rogues gallery.
Each issue of the story would pit the eponymous Ace of Knaves against another character, be it a hero like Green Arrow, villains such as the Royal Flush Gang, or even, on one occasion, Sherlock Holmes. Several, though by no means all, of the stories ended with The Joker's capture, though he would typically drag down anyone who had betrayed him as well.
As revealed in the original edition of the Greatest Joker Stories Ever Told trade-paperback, editor Mike Gold recalls that the ninth and final issue of the series billed an upcoming but never-released tenth issue, featuring the story "99 and 99/100% Dead", which would pit The Joker against the Justice League of America. According to Gold, DC's executive editor at the time, Julius Schwartz, had no recollection of the story ever being completed.