List of Doctor Who episodes (1963–1989)
Season 16 (1978–1979)
Season 16 consists of one long story arc encompassing six separate, linked stories. This season is referred to by the umbrella title The Key to Time and has been released on DVD under this title.

List of Doctor Who episodes (1963–1989)

Section Title: Season 16 (1978–1979)
Table Section Text: Season 16 consists of one long story arc encompassing six separate, linked stories. This season is referred to by the umbrella title The Key to Time and has been released on DVD under this title.

Story	Serial	Serial title	Episode titles	Directed by	Written by	Original air date	Prod. code	UK viewers (millions)	AI

98	1	The Ribos Operation	"Part One"	George Spenton-Foster	Robert Holmes	2 September 1978	5A	8.3	59

"Part Two"	George Spenton-Foster	Robert Holmes	9 September 1978	5A	8.1	—

"Part Three"	George Spenton-Foster	Robert Holmes	16 September 1978	5A	7.9	—

"Part Four"	George Spenton-Foster	Robert Holmes	23 September 1978	5A	8.2	67

99	2	The Pirate Planet	"Part One"	Pennant Roberts	Douglas Adams	30 September 1978	5B	9.1	61

"Part Two"	Pennant Roberts	Douglas Adams	7 October 1978	5B	7.4	—

"Part Three"	Pennant Roberts	Douglas Adams	14 October 1978	5B	8.2	64

"Part Four"	Pennant Roberts	Douglas Adams	21 October 1978	5B	8.4	64

100	3	The Stones of Blood	"Part One"	Darrol Blake	David Fisher	28 October 1978	5C	8.6	—

"Part Two"	Darrol Blake	David Fisher	4 November 1978	5C	6.6	—

"Part Three"	Darrol Blake	David Fisher	11 November 1978	5C	9.3	—

"Part Four"	Darrol Blake	David Fisher	18 November 1978	5C	7.6	67

101	4	The Androids of Tara	"Part One"	Michael Hayes	David Fisher	25 November 1978	5D	9.5	—

"Part Two"	Michael Hayes	David Fisher	2 December 1978	5D	10.1	65

"Part Three"	Michael Hayes	David Fisher	9 December 1978	5D	8.9	—

"Part Four"	Michael Hayes	David Fisher	16 December 1978	5D	9.0	66

102	5	The Power of Kroll	"Part One"	Norman Stewart	Robert Holmes	23 December 1978	5E	6.5	—

"Part Two"	Norman Stewart	Robert Holmes	30 December 1978	5E	12.4	—

"Part Three"	Norman Stewart	Robert Holmes	6 January 1979	5E	8.9	—

"Part Four"	Norman Stewart	Robert Holmes	13 January 1979	5E	9.9	63

103	6	The Armageddon Factor	"Part One"	Michael Hayes	Bob Baker and Dave Martin	20 January 1979	5F	7.5	65

"Part Two"	Michael Hayes	Bob Baker and Dave Martin	27 January 1979	5F	8.8	—

"Part Three"	Michael Hayes	Bob Baker and Dave Martin	3 February 1979	5F	7.8	—

"Part Four"	Michael Hayes	Bob Baker and Dave Martin	10 February 1979	5F	8.6	—

"Part Five"	Michael Hayes	Bob Baker and Dave Martin	17 February 1979	5F	8.6	—

"Part Six"	Michael Hayes	Bob Baker and Dave Martin	24 February 1979	5F	9.6	66

Sentence(s)

Douglas Adams wrote the Doctor Who serials, "The Pirate Planet", which was the second serial in season 16.

final_sentence: Douglas Adams wrote the Doctor Who serials, "The Pirate Planet", which was the second serial in season 16.