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Conquest of Space (1955) movie poster

Plot Summary

Conquest of Space (1955) Plot Summary Explained

Release, runtime and language
1955 · 81 mins · English
Directed by
Byron Haskin
Starring
Walter Brooke, Mickey Shaughnessy, Ross Martin, Joan Shawlee, Vito Scotti, Benson Fong

Watch humanity's bold step toward the Red Planet as a crew of American astronauts departs from their orbital space station on the inaugural mission to Mars. Tensions rise when the commander’s deeply held religious convictions clash with the mission’s scientific objectives, threatening the crew’s unity and the success of the historic voyage.

On this page (6)
  1. 1 Where to watch
  2. 2 What happens: full plot
  3. 3 Plot questions answered
  4. 4 Movie threads
  5. 5 Movies like Conquest of Space
  6. 6 Every angle

Where to watch

Where to Watch Conquest of Space (1955)

Where can you watch Conquest of Space? Stream, rent or buy it in the US, including on FlixFling, Hoopla and Amazon Video: current JustWatch availability with up-to-date prices.

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Full plot summary · contains spoilers

What Happens in Conquest of Space: Full Plot Summary

The whole story of Conquest of Space (1955) explained, from the opening scene to the final frame: every key event, every twist and what it all adds up to. Read it as a quick recap before the sequel, to check a scene you missed, or to finally understand what really happened.

Humankind has achieved space flight and built the Wheel, a vast, orbiting outpost that circles Earth about 1,075 miles (1,730 km) above the surface. On the command deck sits Gen. Samuel T. Merritt, the station’s designer and steady hand, whose leadership is tested by a mix of ambition, faith, and the sheer weight of responsibility. He presides over a small, tightly knit crew, with his son, Captain Barney Merritt, having spent a year aboard and quietly longing to return to Earth.

A few days into their routine, an Earth inspector arrives with a set of new orders that will reshape the mission. Merritt Sr. is being promoted to general and will command a larger, more ambitious ship bound for Mars, instead of the Moon. As the general weighs the options before him, a trusted friend and fellow officer, Sgt. Mahoney, volunteers to join the crew, though Merritt resists, citing the man’s age and the toll such a voyage would take. With Mars declared as the target, the younger Merritt steps forward as the second officer, a decision that will place him squarely in the path of his father’s orbiting world.

The crew is summoned to share a fleeting connection with Earth as they watch a TV broadcast from family and friends before ignition. Then the countdown begins, and the mission roars skyward, dragging the Wheel’s dreams into a new chapter. Yet beneath the countdown and the roar, Merritt’s mind is not fully at ease. He begins to wrestle with space fatigue that he hasn’t diagnosed, a troubling drift of judgment that tugs at his faith and certainty about the mission’s righteousness. The tension between duty and doubt threads through the launch, shaping every choice that follows.

Almost immediately, a complication arises: Sgt. Mahoney is discovered to be a stowaway, having hidden inside a crew spacesuit. The revelation forces the team to confront questions of trust, discipline, and the bounds of loyalty as they press toward Mars. A malfunction in the piloting radar antenna compounds their perils, forcing two crew members to venture outside for repairs. They manage to restore the system just as their monitors reveal a glowing planetoid hurtling toward them, a cosmic hazard that could erase their chance at a successful return home.

Merritt’s instinctive response is to push the engines to veer away, yet his decision comes with consequence. The planetoid’s debris tears through the void and claims a life: Andre Fodor, the mission’s tactful scientist, is killed when a punctured spacesuit leaves him breathless in the black. A solemn ceremony in the emptiness follows, and Fodor’s disappearance is cast into the silence of space, a reminder of how fragile the line between victory and vanishing into the void can be.

Eight months slip by, and the general’s inward strain deepens into a dangerous belief: the loss of Fodor is not merely tragedy but a form of divine judgment. The crew senses the widening rift between what they are doing and what the general believes they should be doing. As Mars grows closer on their approach, Merritt’s mental weather worsens, and he makes a shocking move—an attempt to crash their supposed path to exploration, convinced that the mission contravenes cosmic law. Barney steps in, seizing control from his father and guiding the craft to a courageous, precise landing that proves his readiness to lead.

The moment of arrival on Mars is bright with achievement but soon darkened by the cold realities of another threat: sabotage. The ship’s return rocket leaks, and Barney discovers that the tap is not merely a mechanical fault but a calculated act of treachery born from the crisis unfolding on the ship’s deck. The general’s anger comes to a head in a confrontation that ends with a pistol’s discharge, and Merritt is killed. Sgt. Mahoney, who has observed only the last stages of the struggle, contemplates a court martial for Barney, yet he recognizes that racing to condemn the son of the man who led them here would sully a once-sterling career.

With the Mars mission behind them in the sense of its immediate danger, the crew must improvise to survive on a planet that proves to be unforgiving and arid, its resources thin and its weather severe. Water becomes a precious, sought-after commodity as they reckon with a return window that is a long year away if they cannot endure. A Christmas on Mars—a quiet, muted celebration—surges with a fragile hope as a fresh snowfall replenishes their dwindling supply. The crew steadies themselves for the long haul, clinging to each other and the memory of Earth as they wait for the moment they can finally rejoin the heavens.

As the launch window reopens, a hammering tremor shakes the Martian surface and their ship tilts toward an uncertain fate. The crew fights for a second chance, employing the rocket’s thrust to adjust the ship’s stance and coax a precarious ascent. The enormous gamble pays off at the last possible moment, and the craft lifts away from a crumbling red world, slipping back into the quiet depths of space just as the surface fails beneath it.

Back in orbit, a reconciliation quietly forms between Barney and Mahoney. The older officer, impressed by Barney’s leadership under fire and his ability to guide a crew through the crisis, decides that pursuing a court martial would tarnish the memory of the mission’s true hero: the man who dared to conquer space but paid the ultimate price in the line of duty to save those he led. The weight of sacrifice lingers, a reminder that progress in the final frontier is earned not only through technical prowess but through the courage to do what is right when the universe tests you most.

This tale of ambition, duty, and a father’s fall from grace toward a mission’s uncertain fate unfolds with a stark honesty. It dissects the human cost of pioneering skies and the moral calculus that accompanies every leap toward the unknown—a story that lingers long after the last echo of rocket exhaust fades into the vacuum of space.

Cast echoes, through the actors who gave life to the film’s key figures, include Rosie McCann and others who helped shape this odyssey into a meditation on leadership, loyalty, and the quiet, sometimes painful, triumph of those who choose to carry on when the stars threaten to close in. The world of space exploration, with its gleaming machines and fragile human hearts, remains as compelling as ever in this enduring chronicle.

Last updated: October 09, 2025 at 09:26

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Plot questions answered

Conquest of Space Plot Explained: Your Questions Answered

The questions people ask most about Conquest of Space (1955): what happens in the confusing scenes, why the characters do what they do, the twists, hidden details and what the ending means. Each answer contains spoilers.

Q1

Why does General Merritt try to crash the spaceship?

Eight months into the voyage, General Merritt becomes increasingly unstable due to space fatigue. He interprets the death of Andre Fodor during the planetoid incident as divine punishment, convincing himself that the Mars mission violates cosmic law. When the ship approaches Mars, he attempts to crash it to prevent what he believes is a transgression against God's will.

Foreshadowing: Early in the journey, Merritt is shown reading his Bible and questioning whether the mission is righteous, foreshadowing his eventual breakdown.

  • general merritt
  • space fatigue
  • religious conviction
  • mission crash
  • divine punishment
Q2

How does Andre Fodor die?

When the spaceship narrowly avoids colliding with a glowing planetoid, General Merritt fires the engines to evasively maneuver. The planetoid's debris tears through space and punctures Sgt. Fodor's spacesuit, killing him instantly. His body is later cast adrift in space following a religious ceremony.

Foreshadowing: The radar failure earlier forces crew members outside for repairs, establishing the vulnerability of the crew to external space hazards.

  • andre fodor
  • death
  • spacesuit
  • planetoid
  • debris
Q3

Why does General Merritt die in the confrontation with Barney?

After landing on Mars, Barney discovers that the water supply has been sabotaged, apparently by General Merritt, who has become convinced the mission is cursed. During their confrontation, Merritt threatens Barney with a .45 caliber pistol. The struggle ends when the pistol discharges, killing Merritt. It remains ambiguous whether this was intentional or accidental.

Foreshadowing: Merritt's erratic behavior throughout the journey, including his fixation on Fodor's death as divine judgment, builds toward this violent confrontation.

  • general merritt
  • barney merritt
  • death
  • pistol
  • mars
  • sabotage
Q4

Why does Sgt. Mahoney decide not to pursue a court martial against Barney?

Mahoney witnesses only the final stages of the confrontation between Barney and General Merritt. Though he considers charging Barney with murder, he recognizes that pursuing a court martial would tarnish the memory of the general, a man who led them to Mars and made the ultimate sacrifice. Instead, he chooses to honor Merritt's legacy and acknowledge Barney's capable leadership during the crisis.

Foreshadowing: Throughout the journey, Mahoney demonstrates loyalty to the mission and respect for the general, making his eventual decision to protect the general's legacy consistent with his character.

  • sgt mahoney
  • barney merritt
  • court martial
  • legacy
  • reconciliation
Q5

Why is Sgt. Mahoney hiding as a stowaway on the mission?

Sgt. Mahoney volunteers to join the Mars mission, but General Merritt initially resists, citing Mahoney's age and concerns about the physical toll of such a long voyage. Mahoney secretly hides inside a crew spacesuit to stow away, determined to be part of the historic mission despite the risks and the general's objections.

Foreshadowing: Before launch, Mahoney's willingness to volunteer despite the general's reluctance establishes his dedication to the mission.

  • sgt mahoney
  • stowaway
  • spacesuit
  • volunteer
  • mission
Q6

Why does General Merritt believe the mission is being punished by God?

After Fodor's death during the planetoid near-miss, General Merritt begins suffering from undiagnosed space fatigue. His mental state deteriorates to the point where he interprets Fodor's death not as a tragic accident but as divine judgment against the Mars mission. This belief drives his subsequent attempt to destroy the ship to prevent what he sees as cosmic transgression.

Foreshadowing: Shortly after liftoff, Merritt is shown fretting and reading his Bible, already questioning the mission's righteousness.

  • general merritt
  • religious belief
  • space fatigue
  • fodor
  • divine judgment
Q7

How does the crew survive on Mars with dwindling water supplies?

After landing on Mars, the crew discovers their water supply has been sabotaged. The planet proves harsh and arid, with resources extremely limited. They must wait nearly a year for the return window to Earth. Their salvation comes when a rare Martian snowstorm occurs during their first Christmas on Mars, replenishing their water reserves and giving them hope to survive until departure.

Foreshadowing: The sabotage of the water supply directly follows the general's breakdown, creating an immediate survival crisis.

  • mars
  • water
  • survival
  • christmas
  • snowstorm
  • resources
Q8

What causes the Martian quake during the return launch?

As the launch window reopens and the crew prepares to leave Mars, a violent Martian quake shakes the surface. Rocks rain down and the ground shifts beneath their ship, causing it to tilt dangerously. The crew fires the rocket engines to shift the ground under the landing legs, propelling the ship upward just as the Martian surface collapses beneath them.

Foreshadowing: The harsh, unforgiving nature of Mars has been established through their year-long struggle for water and survival.

  • marsquake
  • launch
  • escape
  • rocket
  • surface collapse
Q9

How does Barney take control of the ship from his father?

As the ship approaches Mars, General Merritt attempts to crash it to prevent what he believes is a sinful mission. Barney, recognizing his father's unstable state, physically intervenes and wrests control away from his father. He then guides the craft to a precise, courageous landing on the Martian surface, demonstrating his readiness to lead and saving the mission.

Foreshadowing: Barney has spent a year aboard the Wheel space station and volunteered as second officer, establishing his competence and ambition.

  • barney merritt
  • control
  • landing
  • mars
  • leadership
Q10

Why does the radar antenna fail during the voyage?

While en route to Mars, the ship's piloting radar antenna malfunctions, leaving the crew unable to navigate properly. Two crew members must venture outside the spacecraft in spacesuits to repair the antenna. They successfully restore the system just as their monitors detect a glowing planetoid on a collision course with them, forcing the emergency maneuver that leads to Fodor's death.

Foreshadowing: This mechanical failure establishes the fragile nature of the mission and the danger of external space repairs.

  • radar
  • antenna
  • failure
  • repair
  • planetoid
  • navigation

Movie threads

More Movies Like Conquest of Space, by Mood & Story

Curated lists built around what makes Conquest of Space tick: the same mood, the same kind of story or the same emotional payoff. Each list explains why these movies belong together.

Tense Space Mission Morality Tales like Conquest of Space

Astronauts face psychological and moral crises on perilous journeys into the unknown. If you liked the high-stakes ethical dilemmas and psychological tension of Conquest of Space, explore more movies like it. This list features similar sci-fi stories where space missions are threatened by internal crises, moral choices, and the heavy weight of command.

  • tense
  • claustrophobic
  • solemn
  • anxious
  • psychological
  • moral dilemma
  • Tone: tense, solemn, claustrophobic
  • Pacing: steady, deliberate
Why these movies?

The story pattern: Stories in this thread follow a crew on a critical mission where external dangers are compounded by a moral or psychological breakdown, often from a leader. The narrative tension builds from the clash between mission objectives and human fallibility, leading to sacrifice and a sober resolution.

Why they belong together: Movies are grouped here for their shared focus on the immense pressure of space travel, combining a tense tone with ethical quandaries and a claustrophobic setting. They explore how isolation and high stakes test leadership and crew cohesion.

Bittersweet Journeys Marked by Sacrifice like Conquest of Space

Grueling quests where success is achieved, but only after profound personal loss. Fans of Conquest of Space who appreciated its poignant ending will find similar movies here. These films feature stories of survival and accomplishment where the success is bittersweet, earned through difficult choices and personal loss, leaving a lasting emotional impact.

  • bittersweet
  • melancholic
  • solemn
  • brooding
  • reflective
  • sacrifice
  • Tone: melancholic, reflective, bittersweet
  • Pacing: steady
Why these movies?

The story pattern: The narrative pattern involves a group striving toward a clear objective against great odds. A central conflict or tragedy forces a difficult choice, often a sacrifice, which allows the mission to succeed but colors the achievement with melancholy and reflection on the price paid.

Why they belong together: These films share a specific emotional arc: a combination of tense struggle leading to a successful, yet somber, conclusion. The focus is on the emotional weight of survival and the complex feeling of achieving a goal at a great personal cost.

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Every angle

Conquest of Space (1955) Explained: Plot, Timeline & Characters

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