Character Name : Jim Hudson (as Frank Boers Jr.)

Original Name : Frank Bonner

Gender : Male

Character Name : David Fielding (as Skip Shimer)

Original Name : Edward Connell

Gender : Male

Character Name : Susan Turner

Original Name : Barbara Hewitt

Gender : Female

Character Name : Vicki (as Robin Snider)

Original Name : Robin Christopher

Gender : Female

Character Name : Dr. Arthur Watermann (as Fritz Leiber)

Original Name : Fritz Leiber Jr.

Gender : Male

Character Name : Old man in cave

Original Name : Louis Clayton

Gender : Male

Character Name : Reporter Sloan (as Jim Phillips)

Original Name : James Phillips

Gender : Male

Character Name : Doctor Branson

Original Name : Patrick Burke

Gender : Male

Character Name : Nurse

Original Name : Sharon Gray

Gender : Female

Character Name : The Green Giant

Original Name : Jim Duron

Gender : Male