Originally Posted by
MajorHoy
I was first introduced to the character (as well as many other of DC's Golden Age heroes) in Justice League of America #101 (September 1972):
Since other heroes from the Justice League of America and Justice Society of America were already travelling through time to find the missing members of the Seven Soldiers of Victory, the late-comers Golden Age Green Lantern, Mr. Terrific, and the Earth-2 version of Robin went in search of finding out who was in that grave for the Unknown Soldier of Victory.
(Who that was revealed in issue #102.)