Andrew V. McLaglen Director Lloyd Bridges Charlie Englehardt Actor Michael Link Eli `'E.J.'` Mackernutt Actor Jeremy Slate Astronaut Captain Rick Lawrence Actor Jim McMullan Astronaut Ben Pelham Actor Morgan Paull Astronaut Dave Anderson Actor John Carradine Jacob Avril Actor Jack Callahan Dr. Jack Smathers Actor Keene Curtis Tom Estes Actor Edward Faulkner Eli Mackernutt Sr. Actor Walter Brooke Whitehead Actor Barbara Faulkner Mrs. Mary Mackernutt Actor John Cedar Hans Hartmann Actor Stephen Rogers Joey Williams Actor John Cutts Producer