This 8" male figure was nude with painted hair and mask, and featured purple hands to simulate gloves. He also wore the distinctive question-mark-covered green bodysuit and a purple belt. There were no boots or accessories issued.
The Riddler was one of four of Batman's enemies issued as part of this action figure line; the others were the Joker, Catwoman, and the Penguin.
The Riddler first made his debut in issue #140 of Detective Comics in October of 1948; after only a few appearances, the character wouldn't be seen again until 1965 with Batman #171. He would only become a major Batman villain after Frank Gorshin portrayed him in several episodes of the Batman TV series.