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The Lost Planet is a 1953 American science fiction serial film 15-chapter serial which has the distinction of being the last interplanetary-themed sound serial ever made. It was directed by Spencer Gordon Bennet with a screenplay by George H. Plympton and Arthur Hoerl. It appears to have been planned as a sequel to the earlier chapterplay Captain Video: Master of the Stratosphere and shares many plot-points, props and sets, as well as some of the same cast. However, the Video Rangers do not appear, and their uniforms are instead worn by "slaves" created electronically by Reckov, the dictator of the Lost Planet with the help of mad scientist Dr. Grood and enslaved "good" scientist Professor Dorn.