The fifteenth season of Doctor Who ran between 3 September 1977 and 11 March 1978. This season introduced K9 to the series and saw the departure of Leela. It consisted of six serials and twenty-six episodes. 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 Horror of Fang Rock.
Television stories
| # | Title | Writer | Episodes | Notes |
| 1 | Horror of Fang Rock | Terrance Dicks | 4 | |
| 2 | The Invisible Enemy | Bob Baker Dave Martin |
4 | First appearance of K9 Mark I |
| 3 | Image of the Fendahl | Chris Boucher | 4 | |
| 4 | The Sun Makers | Robert Holmes | 4 | |
| 5 | Underworld | Bob Baker Dave Martin |
4 | |
| 6 | The Invasion of Time | David Agnew, aka Anthony Read Graham Williams |
6 | Final appearance of Leela and K9 Mark I; introduction of K9 Mark II |
Main cast
- The Fourth Doctor - Tom Baker
- Leela - Louise Jameson (leaves the The Invasion of Time)
- K9 Mark I - John Leeson (voice; introduced The Invisible Enemy, leaves The Invasion of Time)
Adaptations and merchandising
Home media
VHS
- Horror of Fang Rock
- The Invisible Enemy
- Image of the Fendahl
- The Sun Makers
- Underworld
- The Invasion of Time
- The Tom Baker Years (excerpts of all the stories)
DVD
All serials of season 15 were released individually in 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 K-9 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 |
| Underworld 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 |