The Devil's Asteroid

In Short

Manly Wade Wellman’s science fiction novella The Devil's Asteroid drops human political exile Fitzhugh Parr onto a tiny, terraformed asteroid governed by a sinister Martian secret: a force that physically degrades humans into pre-human apes and lesser beasts. As the community’s newest arrival, Parr is thrust into leadership over a desperate band of degenerating prisoners. To survive, he must navigate treacherous internal mutinies, outwit his alien captors, and uncover the mechanism driving the reverse-evolution. Published during the golden age of pulp magazine adventure, the story endures for its punchy execution of a high-concept premise, blending Darwinian dread with classic space-opera heroics.

The Story

The tale opens aboard a Martian space-patroller as Terrestrial convict Fitzhugh Parr is exiled to a small, artificial worldlet nineteen miles in diameter. Condemned for striking a Martian official in self-defense, Parr is stripped of his boots and tunic and dropped onto the lush, green asteroid. Upon landing, he stumbles into a ragtag community of human male exiles who immediately crown him their leader. The colony abides by a singular law: the newest arrival is always the most biologically pristine, and thus commands the rest. Sadau, a gaunt thief, reveals the horrific truth of their prison. The Martians have harnessed a force that turns human evolution backward, slowly regressing the convicts into hairy, low-browed beast-men who are eventually driven into the wilderness as they lose their reason.

Unwilling to accept his grim fate, Parr plans an ambush on the next supply ship to steal a way home. Joined by a new exile, a young woman named Varina Pemberton, Parr leads a daring assault on the landing field. However, hesitation by Shanklin, a bitter former chief, causes the raid to fail, leaving several exiles dead and the patroller escaping into space. In the aftermath, Shanklin turns the bitter colony against Parr, deposing him and driving him out into the wild thickets wearing a mysterious suit of hollow Martian armor salvaged from a dead alien hand.

Cast out among the fully devolved outcast horde, Parr uses his fists and quick wits to challenge their hulking leader, Ling, and earn the trust of the beast-men. Noticing a strange mechanical vibration within his armor, Parr realizes the plates emit a frequency designed to shield the wearer from the retrogressive field. Seeking answers, he leads a small party of beast-men to the asteroid's north pole. There, inside a dark crater, he discovers Varina Pemberton and Sadau secretly tampering with a massive metal control wheel embedded in the rock core. Before Parr can interfere, Varina fires a warning shot and seals the subterranean chamber.

When a heavily armed Martian patrol returns to demand the missing armor, Parr attempts to hijack their vessel with the help of Ruba, a devolved exile who slowly recalls his past pilot training. Before they can launch for Earth, Varina confronts Parr, pointing out that returning mutated men to Earth will ignite an inter-planetary war and ruin the exiles' lives. Realizing she speaks the truth, Parr abandons the ship and flees into the wilderness with his loyal follower Ling.

Weeks later, Sadau tracks Parr down with astonishing news: the evolutionary regression has stopped and is rapidly reversing. The beast-men are regaining their human forms. Varina, revealed to be a colonel in Earth's military intelligence, had deliberately journeyed to the asteroid core to inverse the Martian machinery, turning it into a force for biological recovery. Parr races back to the village just as an Earth Fleet garrison arrives to claim the asteroid as a strategic military base. With Shanklin subdued and the alien threat neutralized, Parr is appointed governor of the recovering colony, stepping forward into a new future alongside Varina.

How It Unfolds

Exile to the miniature world Fitzhugh Parr is deposited by Martian wardens onto a tiny, mist-shrouded asteroid. He is greeted by a community of ragged men who immediately name him chief according to their law that the newest, healthiest arrival must rule.

The horror of backward evolution Sadau explains the true nature of their prison, showing Parr how the exiles gradually regress into coarse, hairy ape-creatures. Horrified by the prospect of losing his humanity, Parr vows to find a way off the rock.

The failed raid and banishment Parr leads an ambush against a returning Martian patroller, but the plan collapses due to internal cowardice, leaving two men dead and allowing the ship to flee. The colony turns on Parr, voting to banish him into the wilderness under the leadership of the bitter Shanklin.

Unlocking the armor's secret Admitted into the camp of devolved outcasts, Parr defeats their brute leader Ling and earns their absolute loyalty. While resting, he examines a captured suit of Martian armor and discovers it vibrates with a frequency that neutralizes the degradation field.

Confrontation at the pole Parr leads a party to the asteroid's northern crater and catches Varina Pemberton and Sadau operating a subterranean mechanism. Varina warns Parr off at gunpoint and jams the controls, sealing the deep shafts beneath the surface.

The strategic retreat Parr and his beast-men briefly seize a second Martian vessel, but Varina convinces Parr that returning to Earth will spark a catastrophe. Parr surrenders the ship, returns the protective armor, and retreats into hiding with Ling as his body begins to heal.

The tide turns Sadau finds Parr in the wilderness to report that Ruba and Ling are regaining their speech, intelligence, and human features. Varina had actually reversed the core mechanism to undo the biological damage, setting the stage for Earth forces to liberate the colony.

The People

• Fitzhugh Parr: A tall, long-jawed Terrestrial exiled for striking a Martian official in self-defense. Driven, stubborn, and resourceful, he refuses to accept degeneration, earning the loyalty of both human exiles and devolved beast-men through physical courage and clear leadership.
• Varina Pemberton: A newcomer who initially appears to be just another helpless exile, but is actually a brilliant colonel in Earth's military intelligence. Focused and decisive, she undertakes a secret mission to sabotage the Martian core and protect Earth from a devastating war.
• Sadau: A gaunt, freckled thief serving time for stealing Martian property. Wise, friendly, and observant, he acts as Parr's initial guide to the asteroid's grim realities and remains a loyal ally through every twist of political intrigue.
• Ling: A towering, six-foot-six giant of an outcast who has regressed into a terrifying, browless brute. After being bested by Parr in a duel of bludgeons, he becomes a fiercely devoted protector whose simple loyalty highlights the lingering humanity within the beast-men.
• Shanklin: A sallow, scheming ex-chief who resents losing authority to newer arrivals. Malicious, cowardly, and opportunistic, he repeatedly undermines Parr's tactical plans to grab power for himself.
• Ruba (Frank Rupert): A flattened-featured beast-man who was once an Earth pilot. Under Parr's encouragement, his fading intellect sparks back to life, enabling him to operate complex rocket controls despite his ruined speech.

In Its Own Voice

"Under treaty between Mars and Earth, judges of one planet cannot sentence to death criminals from the other, not even for murder--"

The Martian skipper coolly explains the loophole in planetary law that permits a fate far worse than execution.

"The latest comer is always highest and wisest. He is healthiest. Best. The longer you stay on this asteroid, the lower you fall."

Sadau welcomes Parr to the exile settlement by detailing the bizarre rule of order born from their shared biological decay.

"They'd be the logical explorers to find a place where such things can be, and to make use of it. Don't believe me if you don't want to. Time and life here will convince you."

Reflecting on the alien nature of their captors, Sadau warns the newly arrived protagonist that time itself is their greatest enemy.

What It's Really About

Beneath its energetic pulp exterior, The Devil's Asteroid wrestles with the fragility of human identity and the thin line separating civilization from brute primitivity. The narrative poses a terrifying psychological question: what remains of a person's moral worth when their intellect, appearance, and memory are stripped away by external forces? By contrasting the treacherous political maneuvering of the "civilized" village with the unselfish, protective camaraderie of Ling and the outcast horde, the story argues that true humanity is defined by loyalty and empathy rather than outward physical form. It also serves as a sharp critique of penal cruelty, illustrating how systemic punishment can degrade both the jailer and the jailed.

Why Read It Today

Science fiction enthusiasts and fans of mid-century pulp fiction will find The Devil's Asteroid a fast-paced, highly inventive slice of classic space opera. Manly Wade Wellman writes with narrative momentum and visual clarity, creating an evocative setting where alien technology meets Darwinian horror. The story moves rapidly through tight action beats, avoiding unnecessary padding while delivering genuine suspense.

Readers should expect the stylistic conventions of 1940s magazine fiction, including melodramatic dialogue, rapid plot shifts, and period-typical stock character types like the square-jawed hero and the surprisingly capable undercover heroine. The alien physiology—Martians described as tentacled, bladder-bodied beings relying on synthetic voice-boxes—reflects the vivid, uninhibited imagination of early speculative fiction.

What stays with the reader long after the final rocket blast is the surprisingly warm depiction of the outcast beast-men. Rather than treating the regressed prisoners as mere monsters to be slaughtered, Wellman endows them with tragic dignity, making their path back to humanity the emotional heart of the adventure.

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