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David Tennant

Tenth Doctor Doctor Who Specials Final Appearance Catherine Tate

Ncuti Gatwa Debuts as 15th Doctor in 'Doctor Who' Christmas Special

Episode introduces Millie Gibson's character, Ruby Sunday, and hints at future musical episodes.

Doctor Who's 'Bi-Generation' Twist Overshadows Historic Casting of Ncuti Gatwa

Doctor Who Introduces Bi-Generation, Two Doctors to Lead Separate Lives