8.0 The Mystery of the Third Planet Jan. 01, 1981 The Mystery of the Third Planet IMDb: 8.0 1981 50 min 2413 views At the end of the 22nd century, the schoolgirl Alisa Selezneva was lucky enough for her dad, a professor of cosmozoology, to take her on his next ... AdventureAnimationFamilyFantasyScience Fiction