Doctor Who: Classic

UNIT are at a project run by Professor Stahlman who intends to penetrate Earth’s crust. But the drilling has already released something deadly from beneath the Earth’s surface.

The green slime oozing from the drill head is transforming men into monsters. Stahlman refuses to listen to the warnings and resorts to sabotage so that his project may continue.

Transported to a parallel world, the Doctor discovers that England is under military rule and the drilling project is at a more advanced stage.

In the parallel world, the drilling project is about to penetrate the Earth’s crust. The Doctor, arrested as a spy, is unable to convince his captors of the danger that faces them.

Earth's crust has been penetrated, releasing terrible forces from within the Earth. The Doctor must escape back to his world to prevent the same catastrophe.

As the Earth in the parallel world faces destruction, the Doctor is desperate to return to his world to warn them of the danger. But time is running out.

The Doctor has escaped the doomed, parallel Earth and has returned to his own world where he attempts to put a halt to the drilling project.