Written by France E. Herron and various. Art and cover by Bob Brown. Thrill to more than 500 pages of comic action collected from CHALLENGERS OF THE UNKNOWN #18-37 (1961-1964)! Along the way, the intrepid foursome faces dangers of every imaginable sort, including cosmic-powered alien beasts, doomed worlds, futuristic knights and much more. 528 pg, B&W.