Justin back to the inn under some manner of mind control. Nyah then brings Professor Hennessy aboard her spaceship to view the technological achievements of Martian civilisation, including the ship's atomic power source. In exchange for Tommy, Carter volunteers to go to Mars with Nyah. Realising that the only road to victory over Nyah requires trickery, Hennessy suggests Carter sabotage the ship's power source after take off. However, Carter attempts a double cross before boarding the ship, snatching Nyah's controller for Chani, but this attempt is thwarted by Nyah's mind control powers. Carter is released by Nyah, and they both return to the bar, where she announces that she will destroy the inn and kill everyone within when she leaves for London. However she allows for one man to go with her in order to escape death. The men draw lots and Carter wins the draw, still hoping to enact Hennessy's plan to destroy the spaceship. At the last minute, Justin, alone at the bar and now free from mind control when Nyah returns, offers to go with her of his own free will. After take-off he successfully sabotages Nyah's flying saucer, sacrificing himself to save the men of Earth, and atoning for the death of his wife. The survivors celebrate their escape with a drink at the bar. Cast Patricia Laffan as Nyah, the Devil Girl from Mars Hugh McDermott as Michael Carter Hazel Court as Ellen Prestwick Peter Reynolds as Robert Justin/Albert Simpson Adrienne Corri as Doris Joseph Tomelty as Professor Arnold Hennessey John Laurie as Mr. Jamieson Sophie Stewart as Mrs. Jamieson Anthony Richmond as Tommy James Edmond as David Production In an interview with Frank J. Dello Stritto, screenwriter John Chartres Mather claimed that Devil Girl from Mars came about while he was working with The Danzigers, who were producing Calling Scotland Yard that appeared as both an American television series and as cinema featurettes in Great Britain and the British Commonwealth. When production finished ahead of schedule, Mather says he was ordered to use up the remaining film studio time already booked and paid for by working on a feature film for the Danzigers. The interview also claims Patricia Laffan's devil girl costume was economically made by designer John Sutcliffe. The film was made on a very low budget, with no retakes except in cases where the actual film stock became damaged; it was shot