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...
Commentary with actors Nicholas Courtney (Brigadier) and John Le'vene (Benton), producer Barry Letts and script editor Terrance Dicks
Can You Hear the Earth Scream? Cast and crew recall working on the story
Hadoke versus HAVOC Presenter Toby Hadoke reunites surviving members of the HAVOC stunt team and trains with them to perform a stunt himself
Doctor Forever! - Lost in the Dark Dimension
The UNIT Family - Part One A feature looking at the Earthbdund Doctor's 'family' during his exile to Earth and his new role as the UNIT scientific advisor
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