A huge burrowing machine tunnels out of control at ferocious speed, cutting clean through to the center of the earth, to the twilight world of pellucidar. Once there, Dr. Perry and David Innes are threatened by half human creatures, lizard-like birds, and man-eating plants.
Doug McClure
David Innes
Peter Cushing
Dr. Abner Perry
Caroline Munro
Princess Dia
Cy Grant
Ra
Godfrey James
Ghak
Sean Lynch
Hoojah
Keith Barron
Dowsett
Helen Gill
Maisie
