Eight-disc set includes Mysterious Doctor Satan (1940)Following the murder of his adoptive father by the world-domination-seeking Doctor Satan (Eduardo Ciannelli), Bob Wayne (Robert Wilcox) assumes the guise of "the Copperhead." Our slithery hero is the only one who stands between the evil doctor and his acquisition of a newly-invented remote device used to control an army of killer robots. Republic serial co-stars William Newell, Charles Trowbridge, C. Montague Shaw, Ella Neal. 15 chapters; 4 1/2 hrs. BW/Rtg NR King Of The Rocket Men (1949)The venerable rocket pack, helmet, and trusty "up/down" chest controls that appeared in several unrelated Republic serials made their debut here. Young scientist Jeff King dons the flying gear and takes off after the sinister Dr. Vulcan, who plans to hold the city of New York hostage with his destructive Decimator device. Tristram Coffin, Mae Clarke star. 12 episodes; 166 min. On two discs. BW/Rtg NR The Invisible Monster (1950)A malevolent megalomaniac calling himself the Phantom Ruler has devised a formula that renders clothing non-reflective, and he plans to terrorize the globe with an unseen army. Can crack insurance investigator Lane Carson (Richard Webb) cancel his scheme before the old world order disappears? Must-see (sorry) Republic serial co-stars Aline Towne, Stanley Price, Lane Bradford. 12 episodes; 167 min. BW/Rtg NR Flying Disc Man From Mars (1950)A Martian invader (Gregory Gaye) named Mota (no, not Manny Mota!) has designs on conquering the Earth, and with his atomic-powered craft and the aid of an embittered Nazi scientist (James Craven), he just may succeed. Only an intrepid pilot (Walter Reed) and his stalwart crew stand between mankind and their depraved schemes! High-flying Republic serial co-stars Lois Collier, Sandy Sanders, Harry Lauter. 12 chapters; 167 min. BW/Rtg NR Zombies Of The Stratosphere (1952)