Classic British sci-fi adventure starring Jon Pertwee. Having been catapulted into a dimensional void, the Doctor is disturbed by an unusual screeching noise and a series of mutations.

Classic British sci-fi adventure starring Jon Pertwee. The Doctor finds himself in a parallel universe where the Inferno Project is policed by nefarious versions of his friends.

Classic British sci-fi adventure starring Jon Pertwee. The Doctor tries to warn the Inferno staff in the alternate universe that penetrating the Earth's crust will end in disaster.

Classic British sci-fi adventure starring Jon Pertwee. After the Earth's crust is penetrated, the Doctor and Greg try to contain the disaster, but a terrible realisation dawns on them.

Classic British sci-fi adventure starring Jon Pertwee. With the parallel universe doomed to destruction, the Doctor tries to escape the catastrophe - but he's not the only one.

Classic British sci-fi adventure starring Jon Pertwee. Having returned to his own universe, the Doctor must stop Stahlman before the Earth suffers the same fate as the parallel one.

Classic British sci-fi adventure starring Jon Pertwee. The Doctor faces his first battle with his arch-nemesis, the Master, who has stolen an energy device and is creating deadly Autons.

Classic British sci-fi adventure starring Jon Pertwee. The Doctor faces his first battle with his arch-nemesis, the Master who has stolen an energy device and is creating deadly Autons.

Classic British sci-fi adventure starring Jon Pertwee. The Doctor faces his first battle with his arch-nemesis, the Master who has stolen an energy device and is creating deadly Autons.

Classic British sci-fi adventure starring Jon Pertwee. The Doctor faces his first battle with his arch-nemesis, the Master who has stolen an energy device and is creating deadly Autons.