Not of This Earth

An alien from Davanna who adopts the alias 'Mr. Johnson' to blend into Los Angeles society. He is physically distinctive with sunglasses and a perilous need for human blood transfusions. His mission is to study human blood to save his dying race, but his methods are murderous.

Johnson hires Nadine to care for him and becomes entangled in the alien's plots. She is compassionate but ultimately manipulated, and she proves resourceful when she calls the police during the chase. Her loyalty is tested as she navigates danger and moral choices.

Town physician under Johnson's hypnotic control; he represents the scientific authority that can be compromised by supernatural influence. He becomes an unwitting participant in the alien's plan until the danger becomes apparent. His office is a key setting for discovery and conflict.

Johnson's bodyguard who is loyal but ultimately unaware of the true nature of his employer. He discovers evidence of the alien origin, making him a casualty of the danger he helps to access. His death marks a turning point in the pursuit of the truth.

A human character who interacts with the alien's circle in Los Angeles, contributing to the film's social dynamics.

A police patrolman who embodies the authorities trying to solve the series of vampire killings. He is hampered by Johnson's mind control and follows the case to a fatal confrontation. His pursuit leads to the dramatic final chase.

A female from Davanna who arrives seeking a transfusion, her presence intensifies the stakes and reveals the fragility of Davanna's people. Her death underscores the perils of interplanetary contact and the costs of the alien's mission.

A character named Paul Johnson; his role in the plot ties to the alien's human disguise and the broader family or community network within LA. His involvement helps showcase the planter's infiltration of everyday life.

A supporting character who completes the cast of locals Johnson interacts with; his presence adds to the sense of a crowded city where danger can lurk anywhere. He represents the ordinary people who become incidental victims or witnesses.

A minor character offering a human touch of everyday life in the city; her brief scene adds realism and texture to the Los Angeles setting.

An uncredited supporting role that embodies the lower end of the social spectrum encountered by the protagonist on Earth.

A character with a strange label that hints at the alien's world and its experiments. Their presence adds to the sense of otherness and menace.

One of the victims encountered by the alien killer; their death highlights the menace and anonymity of the city at night.

An intermediary figure from Davanna who appears in the plot; included here for completeness.