The Man from Planet X

Ambitious, unscrupulous scientist who discovers the spaceman's musical speech and seeks to extract its technology. He shuts off the alien's breathing apparatus to force a breakthrough and leaves the spaceman for dead. His single-minded pursuit of power leads to his downfall when the military destroys the ship.

Gentle, determined astronomer who hosts the spaceman and collaborates with John Lawrence to seek peaceful communication. He works to safeguard his daughter Enid and to understand the alien without resorting to violence. His leadership contrasts with Mears's greed and underlines the value of cautious, ethical inquiry.

American reporter who teams with the professor and becomes a crucial voice for dialogue with the spaceman. He objects to destroying the ship on moral grounds, advocating rescue over wholesale action. Lawrence ultimately leads a daring escape to save Enid and the professor, balancing curiosity with compassion for the villagers.

Professor Elliot's daughter who goes missing following the spaceman's arrival. Her disappearance becomes a central motivator for the rescue effort and a test of the villagers' resolve. Enid's fate hangs in the balance as the community confronts the alien threat.

A humanoid alien whose plan involves using the ship as a relay station for an invasion from a dying Planet X. He communicates in musical tones and manipulates events to further his aims, creating suspense about humanity's vulnerability. The alien's presence elevates the stakes, forcing humans to weigh contact against imminent danger.

Seaside village constable who witnesses the disappearances and helps coordinate the response with the wider authorities. His role anchors the community's reaction to the crisis and keeps vigilance among the locals.

The inspector who arrives to assess the situation and determine the military response. He embodies the official, measured approach to crisis management and ultimately supports decisive action when necessary.

A village searcher who helps investigate the landing site and the disappearances. He provides practical support to the rescue effort and represents ordinary citizens drawn into extraordinary events.

A grieving spouse whose husband has vanished, representing the civilian fear and sorrow that the crisis provokes. Her perspective underscores the human cost of the ordeal.