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"Listen to that! That's the sound of this planet screaming out its rage!"
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...
The Doctor: Jon Pertwee
Liz Shaw / Section Leader Elizabeth Shaw: Caroline John
Brigadier Lethbridge-Stewart / Brigade Leader Lethbridge-Stewart: Nicholas Courtney
Sergeant Benton / Platoon Under Leader Benton: John Levene
Professor Stahlman / Director Stahlman: Olaf Pooley
Sir Keith Gold: Christopher Benjamin
Petra Williams / Dr Petra Williams: Sheila Dunn
Greg Sutton / Greg Sutton: Derek Newark
Producer: Barry Letts
Director: Douglas Camfield
Scriptwriter: Don Houghton