She moved to Hollywood, where in 1955, she was placed under contract by 20th Century Fox. In that same year, she won the Golden Globe award for Most Promising Newcomer, a title she shared with Anita Ekberg and Victoria Shaw. She graduated to playing major roles in major films. She co-starred with Kevin McCarthy, Larry Gates, and Carolyn Jones, playing Becky Driscoll in the original film version of "Invasion of the Body Snatchers" (1956). She starred opposite Robert Taylor in "D-Day the Sixth of June" (1956), alongside Rock Hudson and Sidney Poitier in "Something of Value" (1957), Mel Ferrer in "Fräulein" (1958), Robert Wagner in "In Love and War" (1958), James Cagney and Don Murray in "Shake Hands with the Devil" (1959) and the last of her 20th Century Fox contract roles opposite Kenneth More in "Sink the Bismarck!" (1960). She then starred opposite Danny Kaye in "On the Double" (1961), and George C. Scott in "The List of Adrian Messenger" (1963). In shooting two films in Ireland, she made a second home there with her husband, Hollywood divorce lawyer Greg Bautzer. Over the following two decades, she guest-starred in dozens of television series, including the title character in several Wagon Train episodes such as “The Barbara Lindquist Story,“ and in occasional cameo roles in films such as "Airport" (1970). She appeared as various British women in the ABC television series "Twelve O'Clock High" (1964–66). In 1966–67, she co-starred with Robert Lansing (who had been the original star of "Twelve O'Clock High") on "The Man Who Never Was", but the series lasted only one season. She guest-starred in 1968 in "The Invaders" in the episode "The Captive", and in 1969, on the second version of "The Donald O'Connor Show". On "Get Smart", "The Rockford Files" and "Hart to Hart", she played beautiful, upper-class schemers and villains. She appeared in the Irish soap opera, "Bracken" (1978–80). In 1993, she returned to television to play Raymond Burr's wife in "The Return of Ironside". In 1956, Wynter married celebrity attorney Greg Bautzer; they divorced in 1981.