It seems certain that our brain gives off energy when we think! Energy that can make things happen! What if that energy output were increased... if the brain were made more powerful? 
- —Mento (Krupp)
Appearing in "A Martian Walks Among Us!"
Featured Characters:
- Venusian (First appearance)
Antagonists:
- Martian Who Walks Among Us (First appearance)
Other Characters:
- CCPD
- WLMI-TV
- Unnamed Newscaster
Races and Species:
Locations:
- Mars
- Earth
- United States of America
- Center City
- United States of America
Items:
- Infra-Red Machine
Vehicles:
- Martian Flying Saucer
Synopsis for "A Martian Walks Among Us!"
A scientist sees a flying saucer land and is overpowered by the larger Martian. Since the creature thinks he's dead, he assumes his appearance and lets slip that only infrared rays can detect his disguise as he gathers information for a planned invasion of Earth. After he departs, our hero, who was only stunned, resolves to alert the authorities but they don't believe him. He builds a device that will alert him to the presence of the creature in his disguise and tracks him to an office building. The device goes off in the presence of the night watchman and the alien shifts into the more powerful Martian form, forcing our hero to flee. He rolls to the side as the Martian charges forward and plunges to his doom down the elevator shaft. Our hero then removes his disguise to stand revealed as a Venusian and affirms their pledge to defend the beloved sister planet Earth from the dangers of outer space.
Appearing in "Trouble Bubble"
Journey Into Unknown Worlds #49
Featured Characters:
- Jonathan Jr. "Jonny"
Supporting Characters:
- Nora
- Jonathan Sr.
- Mr. Bigger
Other Characters:
- Twelve unnamed dinner guests
Races and Species:
Locations:
Items:
- Jonny's Bubble Mixture
Synopsis for "Trouble Bubble"
Journey Into Unknown Worlds #49
Appearing in "The Fantastic Menace of Mento the Mighty!"
Featured Characters:
- Mento (Krupp) (First appearance)
Supporting Characters:
- Gorosaur (Illusion or holographic simulation) (First appearance; dies)
Antagonists:
- Unnamed Doctor (First appearance)
Races and Species:
- Humans
- Gorillas (Referenced)
- Dinosaurs (Referenced)
- Gorosaurs (First appearance) (Illusion or holographic simulation)
- Dogs
Locations:
- Earth
- Europe
- Mento's Castle
- Pacific Ocean
- Unnamed Island
- Europe
Items:
- Mento's Machine
Synopsis for "The Fantastic Menace of Mento the Mighty!"
A scientist discovers his own innate psychic power and builds a machine to slowly enhance it. He is nearly omnipotent after more than a decade, but when his assistant betrays him he finds his muscles too atrophied to repair the device and his powers vanish.
Appearing in "The Gargoyle"
Featured Characters:
- Gargoyle (First appearance)
Supporting Characters:
- "Cosmic Carnival" (First appearance)
- Unnamed Alien Queen (First appearance)
Other Characters:
- Alice (First appearance)
- Charlie (First appearance)
Races and Species:
Locations:
- Earth
- Unnamed Planet
Vehicles:
- "Cosmic Carnival" Rocket
Synopsis for "The Gargoyle"
An ugly man rejected by society applies for a job at a circus. It turns out to be a ruse by aliens who are uniformly gorgeous, and so want a man with an ugly face they find fascinating to marry their queen.
Appearing in "Worm Man"
Featured Characters:
- Worm Man (First appearance)
Supporting Characters:
- Unnamed Client (First appearance)
- Prof. Serak (First appearance)
Antagonists:
- Rat (First appearance)
Other Characters:
- Unnamed General (First appearance)
- Unnamed Major (First appearance)
Races and Species:
Locations:
Items:
- Shrink Pills
- Growth Pills
Synopsis for "Worm Man"
A spy who uses shrink pills in order to eavesdrop on military personnel is chagrined to learn that a rat he has managed to topple into a box has latched onto his growth pills, and the only way he recover the pills is climb down into the box to face the angry rat.
Notes
- "A Martian Walks Among Us!" is reprinted in Strange Tales Annual #1 and Where Monsters Dwell #3.
- "The Gargoyle" is reprinted in Where Monsters Dwell #3.
- "Worm Man" is reprinted and retitled "The Man in the Rat Hole" in Tower of Shadows #6.