Red Planet Mars

Red Planet Mars

Year: 1952

Runtime: 87 mins

Language: English

Director: Harry Horner

Science FictionFaith and religionMonsters aliens sci-fi and the apocalypsePolitics and human rightsImaginative space odysseys and alien encounters

SEE! The first contact between Earth and Mars! Husband-and-wife scientists pick up a pie-in-the-sky TV message supposedly from Mars.

Warning: spoilers below!

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Red Planet Mars (1952) – Full Plot Summary & Ending Explained

Read the complete plot breakdown of Red Planet Mars (1952), including all key story events, major twists, and the ending explained in detail. Discover what really happened—and what it all means.

An American astronomer uncovers images of Mars that hint at dramatic environmental changes engineered by an advanced intelligence. Chris Cronyn Peter Graves and his wife, Linda Cronyn Andrea King, have been reaching Mars through a hydrogen-powered radio transmitter, drawing on ideas once developed by Franz Calder Herbert Berghof, a scientist with a dark wartime past. Their exchanges begin with pure mathematics—concepts like pi—and gradually shift to questions about Martian life, as the messages claim Mars is a utopia where technology has wiped away scarcity and there is no fear of nuclear war.

This astonishing revelation destabilizes politics and economics across the Western world, a shock described as having “done more to smash the democratic world in the last four weeks than the Russians have been able to do in eleven years.” The U.S. government responds with a strict news blackout and orders the transmissions halted, fearing that the Soviet Union could intercept and decode them. The President Willis Bouchey leads the decree, pressing for silence while the world trembles at the implications.

The messages then take a darker turn, declaring that Earth is condemned to an endless fear of nuclear war as punishment for straying from the teachings of the Bible. Revolutions sweep across the globe, and even the Soviet Union is overthrown and replaced by a theocracy, a development celebrated by many in America. The transmissions abruptly stop, leaving a window of unanswered questions and a fragile peace that feels disturbingly precarious.

Calder, armed and confrontational, storms the Cronyns’ lab to reveal what he claims is a hoax: a secret Soviet-funded transmitter hidden high in the Andes, destroyed by an avalanche, with no transmissions since. He taunts Linda about the religious messages, insisting the government invented them to crush the Soviet Union. The Cronyns realize the religious messages were not lies, but Calder’s assertion would be seized upon by a fearful world and threaten the fragile balance that has formed. As Linda pleads for a cigarette, Chris quietly prepares to cut off the hydrogen supply, knowing that a spark would annihilate the lab—and them with it. Calder resists, and when a message begins to come through, he fires at the screen, blowing up the transmitter, himself, and the Cronyns before the message is complete. Yet the first portion decodes, and the President eventually reads aloud the opening lines: “You have done well my good…” followed by the parable’s closing sentiment, “You have done well, my good and faithful servant.”

Cast highlights include a core trio at the heart of the mystery and its consequences, with the narrative expanded by a supporting ensemble that grounds the escalating tension. The key dynamic centers on Chris Cronyn and Linda Cronyn, whose curiosity and courage propel the story from scientific curiosity to global crisis, while Calder’s chilling motive hangs over every decision. The unfolding drama explores how information, belief, and fear can reorder politics and religion on a planetary scale, and how a single choice in a cramped lab can ripple outward to redefine civilization itself.

Cast notes:

  • Chris Cronyn — Peter Graves

  • Linda Cronyn — Andrea King

  • Franz Calder — Herbert Berghof

  • The President — Willis Bouchey

  • Admiral Bill Carey — Walter Sande

  • Stewart Cronyn — Orley Lindgren

  • Roger Cronyn — Bayard Veiller

  • Dr. Boulting — House Peters Jr.

  • Maj. Gen. George Burdette — Tom Keene

  • Mine Owner — Colin Kenny

  • Arjenian — Marvin Miller

  • Secretary of Defense Sparks — Morris Ankrum

  • Russian Official — George Blagoi

Last Updated: October 09, 2025 at 14:14

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