Before Cathy Lee Crosby (1974), Lynda Carter (1975), and Gal Gadot (2017), Ellie Wood Walker was Wonder Woman! In 1967, Batman producer William Dozier created this short film as a pitch to Warner Brothers. From IMDB:
Unlike "Batman," which was campy adventure, "Wonder Woman" was going to be a straight comedy series, along the lines of "Captain Nice." The resulting short written by several writers on the Batman series failed to win Dozier that approval.