Roddy McDowall as Cornelius Kim Hunter as Zira Bradford Dillman as Dr. Lewis Dixon Natalie Trundy as Dr. Stephanie Branton Eric Braeden as Dr. Otto Hasslein William Windom as President of the United States Sal Mineo as Dr. Milo Albert Salmi as E-1 Jason Evers as E-2 John Randolph as the Chairman Harry Lauter as General Winthrop M. Emmet Walsh as Aide Roy Glenn as the Lawyer Peter Forster as the Cardinal Bill Bonds as the TV Newscaster James Bacon as General Faulkner Ricardo Montalb*n as Armando In this film, actor Roddy McDowall returns to the character of Cornelius which _he_played in the first film but not in the second. <sep>, Pronoun: he <sep>, A: Armando <sep>, B: Roddy McDowall