Inferno is a top-secret project that involves drilling down into the crust of the Earth to unleash a new energy source. However, the Doctor, along with his assistant Liz Shaw, is concerned that this drilling will have disastrous consequences for the whole world. His concerns are soon confirmed when the TARDIS throws him into a dangerous parallel universe, where Project Inferno is almost complete and the end of the world is near. 2 ¾ hours on 2 discs. SDH