Batman Vol.1 #426 (Newsstand Edition)
Jason discovers that his "real" mother was really his step-mother, and his birth mother is still alive; Joker escapes from Arkham and Batman chases him to the Middle East where he runs across Jason looking for one of the women he thinks is his mom.
Printed: Dec 1988
Writers: Jim Starlin
Art: Jim Aparo and Mike DeCarlo
Cover: Mike Mignola