MAD MEDICS: "Dr. Jekyll and Mr. Hyde" (MGM/UA Home Video, $24.95) is part of this video company's "Great Books Collection" and the third of many screen versions of Robert Louis Stevenson's classic horror yarn about a doctor who unleashes his sinister alter-ego through a series of weird experiments. This black-and-white 1941 production stars Spencer Tracy, Ingrid Bergman, Lana Turner and Donald Crisp. "Dr. Tarr's Torture Dungeon" (Magnum Entertainment, $59.95) tells Edgar Allan Poe's story of an asylum presided over by a real- live Dr. Demento who tortures the inmates. "Scream and Scream Again" (Vestron Video, $69.95) features Vincent Price, Christopher Lee and Peter Cushing and the tale of yet another mad doctor who creates a race of super humans. Vincent Price pops up again--this time in a humorous vein--in "Doctor Phibes Rises Again." Price is still trying to resurrect his dear, departed spouse.

ANIMAL STORIES: "Cat's Eye" (Key Video, $79.98) is a trio of thrillers by master of the macabre Stephen King. The tales are linked through the adventures of a stray cat who roams from one story to the next. Alan King and James Woods star in the first tale of a New York man who desperately seeks a way to quit smoking. He finds it all right, but the motivation turns out to be that a loved one will be tortured whenever he takes a puff. In the second tale, the feline wanders into a sadistic game of cat and mouse between a fading tennis pro and a millionaire who'll bet on anything--including someone's life. The final tale stars Drew Barrymore as a suburban youngster who is tormented by a vicious troll. A 1942 forerunner of the sensuous Nastassja Kinski version, Embassy Home Entertainment's "Cat People" ($19.95) has a young woman trapped by a curse that turns her into a panther. Also available from the same company (and also at $19.95) is the low-budget sequel, "Curse of the Cat People." "The Company of Wolves" (Vestron Video, $79.95) is a grown-up version of "Little Red Riding Hood" with great special effects a la "American Werewolf in London." Angela Landsbury and David Warner star.