The Tenth Planet

029 – The Tenth Planet
Doctor Who serial
The Cybermen take over the Snowcap base from General Cutler.
Cast
Doctor William Hartnell – First Doctor
Companions Anneke Wills – Polly Michael Craze – Ben Jackson
Others Robert Beatty – General Cutler David Dodimead – Barclay Dudley Jones – Dyson Alan White – Schultz Earl Cameron – Williams Callen Angelo – Terry Cutler John Brandon – American Sergeant Shane Shelton – Tito Steve Plytas – Wigner Christopher Matthews – Radar Technician Ellen Cullen – Geneva Technician Christopher Dunham – R/T Technician Glenn Beck – TV Announcer Roy Skelton, Peter Hawkins – Cybermen Voices Harry Brooks, Reg Whitehead, Gregg Palmer – Cybermen
Production
Directed by	Derek Martinus
Written by	Kit Pedler Gerry Davis (episodes 3, 4)
Script editor	Gerry Davis
Produced by	Innes Lloyd
Music by	Stock music
Production code	DD
Series	Season 4
Running time	4 episodes, 25 minutes each
Episode(s) missing	1 episode (4)
First broadcast	8 October 1966 (1966-10-08)
Last broadcast	29 October 1966 (1966-10-29)
Chronology
← Preceded by The Smugglers Followed by → The Power of the Daleks
List of episodes (1963–1989)

The Tenth Planet is the partly missing second serial of the fourth season in the British science fiction television series Doctor Who, which was first broadcast in four weekly parts from 8 to 29 October 1966. It was William Hartnell's last regular appearance as the First Doctor, and the first story to feature the process later termed "regeneration", whereby the lead character, The Doctor, undergoes a transformation into a new physical form. Patrick Troughton makes his first, uncredited appearance as the Second Doctor.

The serial is also notable as the first story to feature the Cybermen, a race of malevolent cyborgs that became a recurring adversary in later Doctor Who stories. The "tenth planet" in the title makes reference to a fictional lost planet in Earth's Solar System; at the time of production, the Solar System was generally held to consist of nine planets, prior to the redesignation of Pluto as a minor planet.^[1]

The Tenth Planet is an incomplete Doctor Who serial – one of many serials that were affected by the BBC's policy of wiping archived programmes in the 1960s and 1970s. Only three of the four episodes are currently held in the BBC archives; the last episode remains missing, although several short clips, including the regeneration sequence, have been discovered intact. In 2013, The Tenth Planet was released on DVD with a full-length animated reconstruction of its missing footage.^[2]