At the Earth's Core (1976)

A Victorian era scientist and his assistant take a test run in their Iron Mole drilling machine and end up in a strange underground labyrinth ruled by a species of giant telepathic bird and full of prehistoric monsters and cavemen.

Director: Kevin Connor

Cast: Doug McClure, Peter Cushing, Caroline Munro, Cy Grant, Godfrey James, Sean Lynch, Keith Barron, Helen Gill, Anthony Verner, Robert Gillespie, Michael Crane, Bobby Parr, Andee Cromarty, George Hilsdon