The Legend of Ruby Sunday

311a – "The Legend of Ruby Sunday"
311a – "The Legend of Ruby Sunday"
Doctor Who episode
	Promotional title-card
Cast
	Doctor Ncuti Gatwa – Fifteenth Doctor;
	Companion Millie Gibson – Ruby Sunday;
	Guest Jemma Redgrave – Kate Lethbridge-Stewart; Yasmin Finney – Rose Noble; Alexander Devrient – Colonel Christopher Ibrahim; Lenny Rush – Morris Gibbons; Genesis Lynea – Harriet Arbinger; Aidan Cook – The Vlinx; Nicholas Briggs – Voice of the Vlinx; Susan Twist – Susan Triad; Fela Lufadeju – Bailey Sinclair; Bonnie Langford – Melanie Bush; Michelle Greenidge – Carla Sunday; Anita Dobson – Mrs Flood; Angela Wynter – Cherry Sunday; Tachia Newall – Colonel Winston Chidozie; Gabriel Woolf – Voice of Sutekh; Jasmine Bayes – Corporal Alice Sullivan;
Production
Directed by	Jamie Donoughue
Written by	Russell T Davies
Script editor	Scott Handcock
Produced by	Vicki Delow
Executive producer(s)	Russell T Davies; Julie Gardner; Jane Tranter; Joel Collins; Phil Collinson;
Music by	Murray Gold
Series	Series 14
Running time	1st of 2-part story, 44 minutes
First broadcast	15 June 2024
Chronology
← Preceded by; "Rogue"	Followed by →; "Empire of Death"
	List of episodes (2005–present)

"The Legend of Ruby Sunday" is the seventh and penultimate episode of the fourteenth series of the British science fiction television series Doctor Who. It was simultaneously released on Disney+ in the United States on 14 June 2024 and on BBC iPlayer in the United Kingdom on 15 June. A BBC One broadcast followed later in the day. The episode is the first in a two-part story written by Russell T Davies and directed by Jamie Donoughue. The story was concluded with "Empire of Death", which was broadcast the following week on 22 June. The entire two-part story was also given a limited theatrical release.

In the episode, the Fifteenth Doctor (Ncuti Gatwa) and his companion, Ruby Sunday (Millie Gibson), seek UNIT's help in determining the identity of the mysterious woman who has appeared in many of their adventures, as well as the identity of Ruby's mother. The episode also reintroduces the villain Sutekh, following his only previous television appearance in the 1975 serial Pyramids of Mars. It was filmed in July 2023 along with the following episode.