First episode of The Twilight Zone (1959) Gladys Cooper "Wanda Dunn") appeared in. She was also in Nothing in the Dark (1962) and Passage on the Lady Anne (1963).
OPENING NARRATION: "An old woman living in a nightmare, an old woman who has fought a thousand battles with death and always won. Now she's faced with a grim decision-whether or not to open a door. And in some strange and frightening way she knows that this seemingly ordinary door leads to the Twilight Zone."
Between his television debut in 1960 and 1964, Robert Redford appeared on 25 various TV series --- including Nothing in the Dark (1962) --- TV films and occasional movies until a breakthrough film role as closeted gay actor Lewis Wade opposite Natalie Wood in Inside Daisy Clover (1965). This is his only appearance on The Twilight Zone (1959) series. He appears to Mrs. Dunn as a policeman named "Harold Beldon."
IMDb lists this episode at number seven in a ranking of all 156 episodes of The Twilight Zone (1959) series.