Countdown (DC) #31 FN

Countdown (DC) #31 was published by DC in 2007. It was written by Paul Dini, Sean McKeever, and Mark Waid and features art by Keith Giffen, Manuel Garcia, and Brian Bolland. The cover artist for this issue was Talent Caldwell. Countdown (DC) #31 is part of the following storylines/events: New Frontiers; The Origin of the Joker and features appearances by: Donna Troy, Superwoman (Earth-3), Ultraman (Earth-3), Bob the Monitor, Jason Todd, Owlman (Earth-3), Power Ring (Earth-3), Green Lantern (Kyle Rayner), The Jokester, Holly Robinson, Mr. Mxyzptlk, Gsptlsnz, Eclipso (Jean Loring), Mary Marvel, Karate Kid, Triplicate Girl, Buddy Blank, Jimmy Olsen, Serling Roquette, Mickey Cannon, Monarch, Forerunner, The Monitors, Crime Society, Post-IC Earth-3 Superwoman, Post-IC Earth-3 Ultraman, Post-IC Earth-3 Owlman, Post-IC Earth-3 Power Ring, and the Joker. You might find this information about Countdown (DC) #31 helpful: Origin of the Joker.