Spoilers are precisely defined here. Rules vary by the story's medium. Info from television stories can't be added here until after the top or bottom of the hour, British time, closest to the end credits roll on BBC One. Therefore, fans in the Americas who are sensitive to spoilers should avoid Tardis on Sundays until they've seen the episode.



Season 15 of Doctor Who ran from 3 September 1977 to 11 March 1978. It starred Tom Baker as the Fourth Doctor, Louise Jameson as Leela and John Leeson as K9 Mark I. The season opened with Horror of Fang Rock and concluded with The Invasion of Time.


It consisted of six serials comprised of twenty-six episodes. This season introduced K9 to the series and saw the departure of Leela. It was originally intended to include Terrance Dicks' story The Vampire Mutations but, due to a major BBC production of Dracula, it was postponed. It later became Season 18's State of Decay. To replace it, Dicks quickly scripted the season opener, Horror of Fang Rock. The season took a two week transmission break over the 1977 Christmas period, between the broadcast of part four of The Sun Makers and part one of Underworld.

Television stories[]

# Title Writer Episodes Notes
1 Horror of Fang Rock Terrance Dicks 4 First appearance of the Rutans.
2 The Invisible Enemy Bob Baker
Dave Martin
4 First appearance of K9. Return of the main TARDIS control room, and debut of the "grey design".
3 Image of the Fendahl Chris Boucher 4 Final story to be written by Chris Boucher.
4 The Sun Makers Robert Holmes 4
5 Underworld Bob Baker
Dave Martin
4 Contains the most copious use of colour separation overlay of any classic serial to compensate for a lack of budget to build physical sets.
6 The Invasion of Time David Agnew, aka
Anthony Read
Graham Williams
6 First use of the Pseudonym of "David Agnew". Final appearance of Leela and K9 Mark I.



Adaptations and merchandising[]

Home media[]

VHS releases[]

DVD & Blu-ray releases[]

All serials of season 15 were released individually between 2005 and 2011.

Serial name Number and duration
of episodes
R2 release date R4 release date R1 release date
Horror of Fang Rock 4 × 25 min. 17 January 2005 7 April 2005 6 September 2005
The Invisible Enemy
Only available as part of the K9 Tales box set with the Doctor Who spin-off K9 and Company in all regions.
4 × 25 min. 16 June 2008 4 September 2008 2 September 2008
Image of the Fendahl 4 × 25 min. 20 April 2009 4 June 2009 1 September 2009
The Sun Makers 4 × 25 min. 1 August 2011 1 September 2011 9 August 2011
Only available as part of the Myths and Legends box set in Regions 2 and 4.
Only available individually in Region 1.
4 × 25 min. 29 March 2010 3 June 2010 6 July 2010
The Invasion of Time
Available individually or in the Bred for War box set in Regions 2 and 4.
Only available individually in Region 1.
6 × 25 min. 5 May 2008 3 July 2008 2 September 2008

Download/streaming availability[]

Serial name Amazon Video iTunes
Horror of Fang Rock (4 episodes)
The Invisible Enemy (4 episodes)
Image of the Fendahl (4 episodes)
The Sun Makers (4 episodes)
Underworld (4 episodes)
The Invasion of Time (6 episodes)


External links[]