An alien woman named Zamera suddenly appears on the moon and demands that two Alphans accompany her back to her home planet of Vega. Dr. Russell and Tony go with her to Vega and discover a society with two distinct classes that have different plans for the future in mind.
Elenco: Martin Landau , Barbara Bain , Catherine Schell , Barry Morse , Tony Anholt , Nick Tate , Prentis Hancock , Zienia Merton , Clifton Jones , Anton Phillips .