"Eye of the Devil" is a 1966 British mystery/horror film with occult and supernatural themes directed by J. Lee Thompson and starring Deborah Kerr, David Niven and Sharon Tate.
Tate had already made an 'uncredited' appearance in an earlier episode of "Mr. Ed", prior to her role as a Telephone Operator. She appeared in Season 4, Episode 4: "Ed Discovers America", which originally aired on October 13, 1963. She is listed only as a Girl.