Ewing's first television appearance was in 1964 as Marvin Grogan on ABC's sitcom Bewitched in the episode "The Girl Reporter". He also appeared that season as Eddie Fox in the episode "The Christmas Show" of ABC's short-lived The Bing Crosby Show, starring Bing Crosby and Beverly Garland, and in a third sitcom as well in the role of Norman in the episode entitled "Look Who's a Sailor" on CBS's short-lived The Baileys of Balboa.