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.

Nancy is a restless young girl tired of living on a plantation with her three old-maid aunts. Her life brightens when her cousin Lola comes visiting from New York. What she doesn't know is that Lola is fleeing a scandal that erupted when she was caught running around on her husband with her lover, David. It's not long before David comes looking for her, and Nancy falls in love with him. Lola sees a way out of her problem--if she can get Nancy and David to hook up, it will take the heat off of her. Nancy's aunts, who want to get rid of her, are all for the plan, and soon Nancy and David get married. However, things don't quite work out for everyone the way they planned.

A celebration of inter-city trains, from British Transport Films.