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Moontrap

On July 21, 1969, a robotic eye emerges from the lunar soil and observes the landing module of the Apollo 11 mission taking off.

Twenty years later, the Space Shuttle Camelot encounters a derelict spaceship in orbit around Earth. Mission commander Colonel Jason Grant leaves the Shuttle to investigate. He discovers a reddish-brown pod and a mummified human corpse. Both are brought back to Earth, where it is found that they originated on the Moon some fourteen thousand years ago.

Shortly thereafter, the unattended pod comes to life. It constructs a cybernetic body with parts from the lab and pieces of the ancient corpse. The cyborg kills a lab technician and exchanges fire with security guards before Grant destroys it with a shotgun blast to the head.

Using the last completed Apollo rocket, Grant and fellow astronaut Ray Tanner go to the Moon on a search-and-destroy mission. They discover the ruins of an ancient human civilization. Inside, they find a woman in suspended animation who identifies herself in a rudimentary fashion as Mera and reveals the name of the killer cyborgs — the Kaalium.

They survive a Kaalium attack and return to the Lunar Module, with Mera wearing her own spacesuit, but the module is gone. The Kaalium also shoot down the command module, leaving the astronauts stranded on the Moon. In subsequent attacks by the Kaalium, Tanner is killed while Grant and Mera are taken prisoner. The Kaalium head to Earth in a giant ship with the humans aboard.

Grant and Mera free themselves and find the landing module, which has been enmeshed in the ship's machinery. Grant supposes the module was the last piece of equipment that the Kaalium needed to complete their ship. He starts the module's self-destruct sequence before he and Mera exit through a breach in the hull, using his gun's recoil as a propellant. The ship explodes after they have reached safe distance.

Some time later, Grant and Mera are shown as a couple living on Earth. Having learned to speak English, Mera explains that she was put in stasis to warn others about the Kaalium. Grant reassures her that the Kaalium have been defeated. Later, a Kaalium pod that survived the explosion is shown in a junkyard preparing to build itself a new body.

In a post-credits audio clip, Grant speaks to a NASA official about the possibility of any debris that may have fallen to Earth in the aftermath of the ship's explosion. The official dismisses his concerns and assures Grant that any debris from the alien ship would have burned up in the atmosphere.