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
as David Innes
Peter Cushing
as Dr. Abner Perry
Caroline Munro
as Princess Dia
Cy Grant
as Ra
Godfrey James
as Ghak
Sean Lynch
as Hoojah
Keith Barron
as Dowsett
Helen Gill
as Maisie
Anthony Verner
as Gadsby
Robert Gillespie
as Photographer
Michael Crane
as Jubal
Bobby Parr
as Sagoth Chief
