“The Man Who Tampered with Infinity.” A mad scientist uses an “infinity machine” to teleport monsters from other dimensions. “The Human Pets.” An alien boy collects “animals.”

After receiving reports of a super-powered criminal who has gained mystical flame powers, the Challengers are called by June Robbins to an archaeological expedition. She and Professor Brandon are seeking the mysterious Star-Stone, a powerful stone that would grant temporary powers. When it becomes known that someone is finding each of the four stones, and using them for ill-gotten gain, the Challengers undertake to bring this person to justice.

The Challengers are visited one day by their honorary member June and her friend Mary, who have brought them a scroll which she found in a castle she had inherited in the land of Mordania. Showing the Challengers tThe scroll intrigues the group enough to check the castle out, but what they find is not what they were expecting!

From the late 1950s, these are the original tales of four death-defying adventurers and their impossible, unimaginable exploits. After surviving the crash of a small aircraft, test pilot Ace Morgan, daredevil Red Ryan, heavyweight boxing champ Rocky Davis and marine scientist Professor Haley unite as The Challengers of The Unknown. Their mission: to explore the unexplainable for the good of mankind. This beautiful hardcover edition tells the earliest adventurers of these four adventurers as they encounter powerful aliens, deadly robots, and creatures of unknown origins, including a mysterious "star stone" that bestows super-powers, a space circus, monsters from space, a planet populated by robots and more.

Challengers of the Unknown + Doom Patrol

“SEVEN DOORWAYS TO DESTINY!” The cultists have June as a hostage. The Challengers get beaten down by cultists, some half-monster. Monroe explains how M’Nagala came from the stars, as recounted in SWAMP THING #8. He demands Rocky and Ace fly to England and perform an incantation from a mystical book and bring M’Nagala’s “family” to Earth. They go, reluctantly. At Challengers Mountain, Clayburne (the wannabe Challenger) uses the computer to analyze Prof’s infection. It recommends Dr. Alec Holland as an expert in “biochemical abnormalities.” Clayburne flies to Oregon, where Holland teaches, and he agrees to help. Outside London, Rocky chants at midnight in a pentacle, while Ace fetches a pack of jet fuel. M’Nagala-kin try to burst through a portal, all icky tentacles and squishy guts, but Ace chucks the fuel pod “just like Jaws” and shoots, destroying the monster and shutting the portal. Clayburne and Holland land in Perdition, but in the dark, Holland starts to revert to Swamp Thing as his bio-restorative formula wears off. They find Prof half-consumed by icky polyps.

“TO SAVE A MONSTER/WHEN DEADMEN WALK.” Prof is infected with an alien fungus. Swamp Thing watches from cover and is attacked by a wolf, but brushes it off. The wolf is possessed by Deadman, who asks Rama Kushna why he’s there. Back at Challengers Mountain, the heroes can’t cure Prof’s disease. Angry, Ace orders Gaylord to take a walk, which he does. Deadman tries a cure, diving in to possess Prof and fighting from within. Prof sloughs off the fungus and Deadman passes out. Prof wakes, healthy, and announces that Swamp Thing is Dr. Alec Holland, who’s wandered off and needs help. The Challengers search, but Swamp Thing has hopped a freight for Philadelphia. Deadman tries to possess Swamp Thing and bounces—he’s already possessed! Deadman possesses Ace and announces that Swamp Thing is in Philly, where Swamp Thing rages to the state asylum and the cell of Duncan Pramble, the former Multi-Man.

“THE WAR AT TIME’S END.” In the present, Prof is wheelchair-bound in Challengers Mountain, where he is attacked by a mutant lizard from the future. Future-boxes keep releasing monsters around the world, and Red (who quit) battles some in the streets. In the future, Rocky, Ace, June, Swamp Thing and Deadman find Rip Hunter (and his crew) are brainwashed pawns of the despotic Sunset Lords. After a fight, they’re overwhelmed and captured, but Deadman, sneaking around in a borrowed body, meets Lucas Lawspeaker and his rebels.