"Inferno" was a seven-part serial, first broadcast on BBC TV between 9 May 1970 - 20 June 1970. It was written by Don Houghton, and directed by Douglas Camfield (and Barry Letts, uncredited). It starred Jon Pertwee as the Doctor, Caroline John as Liz Shaw and Nicholas Courtney as Brigadier Lethbridge-Stewart.

( Listen to that! It's the sound of the planet screaming out its rage! )

"The Ambassadors of Death" was a seven-part serial, first broadcast on BBC TV between 21 March 1970 - 2 May 1970. It was written by David Whitaker (and Trevor Ray and Malcolm Hulke, uncredited), and directed by Michael Ferguson. It starred Jon Pertwee as the Doctor, Caroline John as Liz Shaw and Nicholas Courtney as Brigadier Lethbridge-Stewart.

( I don't know what came down in Recovery 7, but it certainly wasn't human! )

"Doctor Who and the Silurians" was a seven-part serial, first broadcast on BBC TV between 31 January 1970 - 14 March 1970. It was written by Malcolm Hulke, and directed by Timothy Combe. It starred Jon Pertwee as the Doctor, Caroline John as Liz Shaw and Nicholas Courtney as Brigadier Lethbridge-Stewart.

*****

( We were here before man... )

"Spearhead from Space" was a four-part serial, first broadcast on BBC TV between 3 January 1970 - 24 January 1970. It was written by Robert Holmes, and directed by Derek Martinus. It starred Jon Pertwee as the Doctor, Caroline John as Liz Shaw and Nicholas Courtney as Brigadier Lethbridge-Stewart.

( We deal with the odd... the unexplained. Anything on Earth... or beyond. )