starring Doug McClure
Peter Cushing , Caroline Munro
When their giant burrowing machine hurtles out of control, Dr Perry and his American backer, David Innes , discover a terrifying pre-historic world enclosed in a vast subterranean cave. Captured by a tribe of half-human creatures, the two explorers survive a series of hair-raising adventures until they come to grips with the real rulers of the world-the grisly Mahars.
Screenplay by MILTON SUBOTSKY based on the novel by EDGAR RICE BURROUGHS
Produced by JOHN DARK
Directed by KEVIN CONNOR. Films: p 23 (First showing on British television)