Guest Stars Peter Breck as Senator Jeremiah Orville Harry Townes as Dr. Clifford Scott Alan Baxter as Col. Grover Jason Wingreen as O.B.I.T. Operator Jeff Corey as Mr. Byron Lomax C. Lindsay Workman as Dr. Anderson Konstantin Shayne as Dr. Philip Fletcher Joanne Gilbert as Barbara Scott Robert Benevides as Capt. James Harrison Sam Reece as Clyde Wyatt Uncredited William Douglas as The Helosian Steve Carruthers as Hearing Member
