Challengers of the Unknown [Ace Morgan; Rocky Davis; Professor Haley; Red Ryan]; Thark (alien policeman); Albom (villain, human); Halanka (villain, alien)
Pursuing a criminal, the Challengers find he's partnered with a metallic fugitive from another world. Halanka, the metal alien, pulls their Jeep with magnetism and melts it with heat. Two Challengers rescue an interplanetary lawman, Thark, who comes to their aid. Using Thark's force-field gun, the Challengers get close enough to "bowl" Halanka over.
Challengers of the Unknown [Ace Morgan; Rocky Davis; Professor Haley; Red Ryan]; June Robbins; Sir Manson; Melissa; other inhabitants of the Mirage World; Sir Rodfold
Having crashed in the desert, a dazed June Robbins staggers into a medieval world within a mirage. The Challengers follow to rescue her before the mirage disappears. Captured by knights, the Challengers issue a challenge - a duel with chariots. Despite Sir Rodfold's treachery, the Challengers win through, snatch June, and dive out of the city just before it vanishes forever.