Super DC Giant S-25

Super DC Giant S-25 (On Sale: April 13, 1971), has a Challengers of the Unknown cover by Jack Kirby. 

We begin with "The Man Who Stole the Future" written and penciled by Jack Kirby and inked by Wally Wood and reprinted from Challengers of the Unknown #8 (1959). June’s friend Marie has inherited a castle containing a secret room. The Challengers are called in to solve the mystery. Inside a secret compartment, the Challengers find three boxes. They open the first box, and Ace and Rocky are sprayed with a liquid that restores their youth. In the confusion, the boxes are stolen by a man named Drabny.

The second box contains a helmet that gives Drabny a mind-over-matter ability. Drabny uses his abilities to take over the country of Mordania. Prof and Red go after him but get captured. They are freed by Ace and Rocky, and the youth serum wears off.

Using the helmet, and the contents of the third box, goggles that can see into the future, Drabny continues his goal of conquest against an army of tanks. The Challs help out and use the recovered youth serum to turn Drabny into a child. The devices are destroyed, and Drabny sent to prison.

Next is "Captives of the Space Circus" written and penciled by Jack Kirby and inked by Wally Wood and reprinted from Challengers of the Unknown #6 (1959). The Challengers are captured by a traveling space circus. They are forced to perform acts of daring and kept in cages. The Challs manage to escape from their cells once but there are too many guards to make it far.

During one performance, the Challs meet other performers who are likewise imprisoned. The Challs formulate a plan, and with the help of the other prisoners, the Challs stage a revolt. While the other creatures escape, the Challs lead the guards to a small asteroid. They are cornered by their captors until they realize the atmosphere of the asteroid has given them enormous strength. They round up the ringmaster and his guards and turn them over to the authorities before returning home.

We end this issue with  "The Wizard of Time" written and penciled by Jack Kirby and inked by Wally Wood and reprinted from Challengers of the Unknown #4 (1958). Rocky undergoes an experiment to test a new serum that might help may adapt to extreme environmental conditions. As part of the test, Rocky is launched into space and returns in a space capsule. He emerges from the capsule unharmed, but without his memory. He also now possesses strange powers including the ability to project fire or ice, grow or shrink to any size, and become invisible. Now, if some of these powers seem to remind you of the Fantastic Four, there is a reason for that and it has zero to do with Stan Lee.

Without his memory, Rocky flees from his friends and is eventually found by three fugitives. The crooks plan to use Rocky for their own purposes, but the other Challengers find them. Rocky is wounded during the fight. He regains consciousness with his memory restored and finds his powers have disappeared.

Edited by Murray Boltinoff.