Marshall Thompson

as Director

as Geologist #1

as Dr. Brad Wednesday

as Carter

as Dr. Orin Hillyard

as Dr. Marsh Tracy

as Jonn Sonnenberg

as Cmdr. Charles Ernest Prescott

as Carruthers

as Major Jeff Cummings

as Wilfred Banning Pendleton III

as Johnson

as Tom Markel

as Billy Lang

as Bruce Reeber

as Blivens Scott

as Lance Beaufort

as Gunther Wyckoff

as Rod MacDougall

as Henry Shanway

as Narrator (adult John Kenyon) (voice)

as Jim Layton

as Herbert Fields

as Capt. George Washington Bellpepper Lee

as Staff Sgt. 'Mac' McKeen

as Brandon Reynolds

as Ens. 'Snake' Gardner

as Bill

as Ted Scott