Excerpt from "Science Fiction Television Series: Episode Guides, Histories, and Casts and Credits for 62 Prime-Time Shows, 1959 through 1989, By Mark Phillips, Frank Garcia (2014)":

The Man Who Was Never Born

A mutant from Earth's future travels back in time to prevent the birth of a man who will destroy humanity. Wr: anthony Lawrence. Dir: Leonard Horn.
Andro (Martin Landau); Noelle Andresen (Shirley Knight); Bertram Cabot (John Considine); Joe Reardon (Karl Held); Mrs. McCluskey (Maxine Stuart); Minister (Marlowe Jenson).

Trivia Alert: In a scene filmed but deleted from the original ending, Jack Raine played a man who welcomes Noelle to Earth's beautiful future in 2148.