: The Doctor and UNIT eventually thwart Carrington's broadcast plans and arrange a peaceful exchange: the ambassadors return home, and the human astronauts are released safely to Earth. Production & Cast

: The Doctor takes a solo flight into space—without the TARDIS—to find the real astronauts aboard an alien mother ship.

: Includes Jon Pertwee (The Doctor), Nicholas Courtney (Brigadier Lethbridge-Stewart), and Caroline John (Liz Shaw).

: Primarily credited to David Whitaker , though the final script was heavily rewritten by Malcolm Hulke , Trevor Ray , and Terrance Dicks .

: Features the first instance of the TARDIS console being used while removed from the TARDIS. It is also known for its gritty "Quatermass-style" thriller vibe and extensive location filming. Episode List & Original Air Dates Original Air Date Episode 1 March 21, 1970 Episode 2 March 28, 1970 Episode 3 April 4, 1970 Episode 4 April 11, 1970 Episode 5 April 18, 1970 Episode 6 April 25, 1970 Episode 7 May 2, 1970 Critical Reception

: Michael Ferguson , noted for his use of lens flares and dynamic action sequences.

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