The first manned expedition to Mars is decimated by an unknown life form...which stows away on the rescue ship. Marshall Thompson, Shirley Patterson, Kim Spalding, Edward L. Cahn, 1958

 

Summoned to the silver screen by sci-fi specialist Edward L. Cahn (Curse of the Faceless Man)—and too terrifying to even have a name!—“It” is a seemingly invincible monster that is hell-bent on killing everybody on a mission to Mars. This life-devouring alien brushes aside bullets and even nuclear blasts—making it one very cold-hearted Cold War-style invader. When his crew is brutally murdered on a Mars expedition, Commander Carruthers (Marshall Thompson, First Man into Space) becomes the prime suspect. Taken into custody and facing a court-martial back on Earth, he discovers that the real killer—a grotesque, slithering “It”—has stowed aboard the earthbound ship. But the indestructible creature has already begun a harrowing in-flight rampage, knocking off the members of the crew one by one. Now, as the spaceship heads home toward a panic-stricken Earth, the remaining crew must find some way to stop the unstoppable…“It.” Brand New HD Master – From a 2K Scan of the 35mm Fine Grain | tidbITs: Ephemera from Beyond Space - Featurette by Film Historian Craig Beam | NEW Audio Commentary by Film Historians Tom Weaver, Bob Burns, Larry Blamire and David Schecter | NEW Audio Commentary by Film Historian Craig Beam | NEW Audio Commentary by Film Historian/Screenwriter Gary Gerani | Theatrical Trailer | Reversible Art | Limited Edition O-Card Slipcase | Optional English Subtitles