The Flintstones S5 Ep 2 - Body Swaps

Season 5 Episode 2 Monster Fred
Wilma and Betty arrive at Frankenstone's clinic at Barney's summons, and Frankenstone uses a mind-transfer machine to attempt to cure Fred's amnesiac stupor. A series of personality transfers occur, with Fred and Dino swapping psyches, then Fred and Barney, then Fred and Wilma and Barney and Betty. Frankenstone finally puts everyone's mind into proper body, and Fred, fully recovered, urges his companions to flee the mad scientist.