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This episode is a personal favorite of many a Dawn Wells fan, and with good reason. After suffering a bump on the head, Mary Ann (played of course by Ms. Wells) becomes convinced that she is actually her glamourous fellow Castaway Ginger Grant (Tina Louise). Before long, winsome Mary Ann is not only talking and acting like Ginger, but singing like her as well! In his efforts to bring Mary Ann back to normal, the Professor (Russell Johnson) succeeds only in assuming a different identity himself! (Trivia note: according to Dawn Wells, her singing voice in the "I Wanna Be Loved By You" number was dubbed by no less than Jackie DeShannon).