The Munsters - Season 2 Episode 10 A Man for Marilyn
Overview: To provide poor unfortunate Marilyn with a future husband, Grandpa tries to turn a frog into a prince. Conveniently, he chooses a nearsighted frog who won’t be put off by Marilyn’s hideous looks. Not realizing that the potion has failed, Grandpa and Herman mistake a passing stranger for their princely frog.