They Came from Beyond Space

A brilliant scientist who leads the mission after being sidelined by his doctor. He survives thanks to a silver plate in his skull that helps resist alien possession. His resourcefulness, accuracy with a sniper rifle, and unyielding determination drive the search, the rescue of Lee, and the ultimate confrontation with the extraterrestrials.

Curtis's colleague and lover who manages requisitions and becomes entangled with the alien threat. Initially instrumental in gathering equipment, she is briefly controlled by the aliens and later saved, her memories partially restored by the team's efforts. She remains a central figure whose fate is bound to Curtis's courage.

Curtis's friend who hosts him and helps devise a protective strategy, including crafting a helmet from melted trophies. He aids in using ultraviolet light to exorcise the alien influence and supports the escape plan, playing a crucial role in the human resistance.

An Internal Security operative tailing Curtis, who becomes entangled in the crisis as the plague spreads. His involvement underscores the surveillance state’s role in crisis response, and his fate exemplifies the costs of dealing with an unknown threat.

A senior physician who cautions against dangerous undertakings while the crisis unfolds. He represents the medical establishment's initial hesitation and eventual adaptation to the evolving alien threat.

The alien leader who reveals the extraterrestrials' lunar origin and their desire to return home after repairing their ship. His persuasion underscores the humanity-aliens dynamic and the aliens' weariness with their long voyage.

Temple's medical colleague who appears in scenes of medical oversight, highlighting the medical response to the alien invasion and the tension between healing and the unknown threat.