Challengers of the Unknown #23

Challengers of the Unknown — DC Comics

Issue: #23

Last valuation update: 2026-09-09

First appearances: Zog, Dr. Kue, Burt Langdon

Creators: Bob Brown

Characters: Ace Morgan, June Robbins, Prof Haley, Red Ryan, Rocky Davis, Zog, Dr. Kue, Burt Langdon