The Brigadier has an eyepatch while Scott and guest host Kyle Anderson drill each other about the Jon Pertwee 7 part serial “Inferno”. The Doctor is accidentally transported by the partially repaired TARDIS control console into a parallel universe where an experimental drilling project designed to penetrate the Earth’s crust and release a previously untapped source of energy is at a more advanced stage. Can the Doctor stop his friends’ ruthless alter egos in time to save both universes? What is the oily green liquid that transforms those who touch it into vicious primeval creatures? Why does Professor Stahlman hate the Doctor so much? Find out in the latest episode of The Doctor’s Companion! And remember, BEWARE OF SPOILERS!!

NEXT: David Tennant and “The Unicorn and the Wasp”!!