Roy Thinnes David Vincent Actor Laura Devon Susan Carver Actor Nancy Wickwire Evelyn Bowers Actor Norman Fell Neal Taft Actor Ed Begley Simon Carver Actor Bill Fletcher First Alien Actor Victor Brandt Joey Taft Actor Ivan Bonar Older Alien Actor Joel Fluellen Butler Actor Gilchrist Stuart Waiter Actor Garrison True Young Doctor Actor Ron Stokes Alien at Controls Actor Max Kleven Third Alien Actor John Meredyth Lucas Director John W. Bloch Writer Theodore Sturgeon Writer Alan A. Armer Producer Quinn Martin Executive Producer Anthony Spinner Associate Producer