Doctor Who’sfifteenth season will see the return of Ncuti Gatwa as the iconic Time Lord, with plenty of familiar faces also reprising their roles as the show moves forward for its second rebooted season.With a brand-new companion, many exciting guest stars, and even more creative adventures,Doctor Who’s new season is shaping up to be the show’s most exciting in a long while.
Perhaps more than any other show,Doctor Whois a project that’s always reimagining itself with new cast members. There have been plenty of different lead actors since the show began in 1963, and while fans can argue forever aboutwhich version of the Doctor is the best,the truth is that every iteration of this show’s cast has something special about it; season 15 should be no different.
Ncuti Gatwa As The Doctor
Date Of Birth: 18 June 2025
Actor: Ncuti Gatwa was born in Nyarugenge, Rwanda, in October 1992 and moved to Edinburgh, Scotland, in 1994. Despite appearing in numerous television roles, it wasn’t until 2019’sSex EducationthatGatwa became an overnight star for his portrayal of Eric Effiong, one of the show’s most beloved characters. He was cast as The Doctor inDoctor Whowhile filming for Greta Gerwig’sBarbie,and has portrayed the character in the show’s fourteenth and fifteenth seasons.
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Masters of the Air
Lt. Robert H. Danies
Character:Doctor Who’s protagonist is a time-traveling alien from the planet Gallifrey who journeys the universe in search of new wonders to see and people to save.Multiple actors have portrayed the characterthroughout the sci-fi show’s extended run, with Gatwa marking the fifteenth (canonical)actor to play the Doctor.
Varada Sethu As Belinda Chandra
Date Of Birth: 20 July 2025
Actor: Varada Sethu was born in Kerala, India, in May 1992 and is of Malayali ancestry. Sethu’s family moved to the North East of England, where she attended Dame Allan’s Schools and later joined the National Youth Theater. The actress landed herbreakthrough role inDoctorsas PC Kylie Green, a role which led to her appearing in projects such asNow You See Me 2andDoctor Foster. She also portrayed Cinta Kaz in the first season of Disney’sAndor.
I Came By
Naz
Character: As with any season ofDoctor Who,the Doctor needs a companion to travel alongside him. This season, he encounters a young woman named Belinda Chandra who gets swept up in a whirlwind adventure through time and space.She’s a distant relative of Mundy FlynnfromDoctor Who’s previous season, an Anglican Marine whom the Doctor and Ruby Sunday encountered in the episode “Boom.”
Millie Gibson As Ruby Sunday
Date Of Birth: 09 August 2025
Actor: Millie Gibson was born in Greater Manchester in 2004, where she attended the Blue Coat School in Oldham. She landed her breakthrough role in thechildren’s TV seriesJamie Johnsonin 2017, and gained nationwide fame for her subsequent portrayal of Kelly Neelan in the long-running soap operaCoronation Street.
Butterfly
Lily Duffy
Character: Ruby Sunday was first introduced as the companion to Ncuti Gatwa’s Doctor in the 2023 Christmas special “The Church on Ruby Road”, appearing in every episode of the season that followed. Despite concerns that she would be leaving the show after just one season, it was announced thatGibson’s character would be reduced to a recurring role in this year’s seriesto make room for Varada Sethu’s new companion.Ruby Sunday will still play a role in season 15, though it will sadly be reduced.
Jemma Redgrave as Kate Lethbridge-Stewart
Date Of Birth 14th January 1965
Actor: Jemma Redgrave was born in London in 1965, the daughter of British actor Corin Redgrave and his first wife, Deirdre Hamilton-Hill.Her career began on the stage, where she landed a string of high-profile roles in the ‘80s and ‘90s, including Titania inA Midsummer Night’s Dreamalongside Dawn French and Sophie inChatskyalongside Colin Firth.She began playing Kate Lethbridge-Stewart inDoctor Who’s seventh season in 2012.
Love & Friendship
Lady DeCourcy
Character: Kate Lethbridge-Stewart is the current head of the Unified Intelligence Task Force (aka U.N.I.T.), who have assisted the Doctor throughout his many adventures on Earth.She is the daughter of Brigadier Alistair Gordon Lethbridge-Stewart, who appeared inDoctor Who’s classic era.Kate struck an unlikely romance inDoctor Who’s fourteenth season, which may be explored in the upcoming episodes.
Doctor Who Supporting Cast & Characters
Bonnie Langford as Mel Bush- Mel Bush is one of the many companions of classicDoctor Whothat’s been brought back in recent years, appearing alongside Jodie Whittaker’s incarnation of the Doctor shortly before her regeneration. She was originally a companion of Colin Baker’s Sixth Doctor, and now works alongside U.N.I.T. to assist Gatwa’s Doctor from time to time.
Anita Dobson as Mrs. Flood-The mystery of Mrs. Flood’s true identityis one ofDoctor Who’s biggest questions as it enters its fifteenth season. The character appeared briefly as Ruby Sunday’s neighbor in season 14, before breaking the fourth wall and speaking directly to the audience about the Doctor’s past. Anita Dobson will reprise her role in the upcoming episodes, as the truth about her identity is hopefully revealed.
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Jonah Hauer-King as TBC-The Little Mermaid’sJonah Hauer-King has been cast in a major role inDoctor Who’s upcoming season, though details of his character have not yet been released. His previous credits includeA Dog’s Way HomeandThe Tattooist of Auschwitz.
Susan Twist as Susan Triad-Susan Triad is officially returning toDoctor Whofollowing her many cameos in the previous season, when it was revealed that she was an agent of Sutekh, leader of the Pantheon of Gods. It’s unclear exactly how her story will connect to the Doctor’s future adventures, though her involvement suggests that Russell T. Davies isn’t finished withDoctor Who’snew Pantheon of Gods.
Doctor Who
Cast
Doctor Who: Released on June 16, 2025, this series follows the Doctor and their companion as they journey across time and space, encountering a range of extraordinary friends and adversaries, expanding the universe of the long-running British science fiction series.
