Guest Stars Peter Breck as Senator Jeremiah Orville Alan Baxter as Col. Grover Harry Townes as Dr. Clifford Scott Jeff Corey as Mr. Byron Lomax C. Lindsay Workman as Dr. Anderson Jason Wingreen as O.B.I.T. Operator 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
