Strange Tales Vol.1 #164
Hurling thru the void of space, Strange sees a vision of Victoria Bentley, surrounded by machinery; He lands on a jungle planet inhabited by savage, monstrous creatures; Strange finds an underground cavern, and inside it, an elaborate machine, from which emits a mental challenge; Yandroth, Scientist Supreme, claims to have unlocked the "inner-most secrets of the cosmos"
Printed: Jan 1968
Writers: Jim Lawrence, Dan Adkins, Jim Steranko, and Bill Everett
Art: Dan Adkins, Jim Steranko
Cover: Dan Adkins