Special Guest Stars Michael Rennie as Magnus Guest Stars Patricia Smith as Edna Greely Katherine Justice as Helen William Smithers as Nat Greely Co Starring Paul Carr as Billy Stearns Dabney Coleman as Captain Mitchell Ross Harry Lauter as Alien #2 Erik Holland as M.P. Alien Robert Doyle as Sgt. Walter Ruddell Frank Marth as Alien #1 Johnny Jensen as Young Nat