Challengers of the Unknown #2

Challengers of the Unknown — DC Comics

Issue: #2

Last valuation update: 2026-09-09

“The Monster Maker.” Ace fights a criminal who uses a mind-over-matter machine. “The Traitorous Challenger.” June Robbins sees a computer that predicts that the Challengers will die if they battle an atomic creature.

First appearances: Roc, Dr. Hascomb, Digger Bill

Creators: Jack Kirby, Marvin Stein

Characters: Ace Morgan, June Robbins, Prof Haley, Red Ryan, Rocky Davis, Roc, Dr. Hascomb, Digger Bill