Cast of Doctor Who: All Actors & Companions in Order

When Doctor Who first aired on 23 November 1963, few could have predicted that six decades later its lead character would have been played by 15 different actors. The show’s central conceit—regeneration—has let it reinvent itself while keeping the same name, with this guide walking you through every major actor and companion in the Whoniverse from the original TARDIS crew to the latest season.

Number of actors who have played the Doctor: 15 (as of 2025) ·
First Doctor actor: William Hartnell ·
Current Doctor actor: Ncuti Gatwa ·
Longest-serving Doctor: Tom Baker (7 seasons, 1974–1981) ·
Total episodes (1963–present): 871

Five key facts that define the franchise, from its birth date to the number of actors who have stepped into the TARDIS.

Who has played Doctor Who in order?

Chronological list of all actors who portrayed the Doctor

• First Doctor: William Hartnell (1963–1966) – introduced alongside companions Susan Foreman, Ian Chesterton, and Barbara Wright.
• Second Doctor: Patrick Troughton (1966–1969) – known for Jamie McCrimmon, Victoria Waterfield, Zoe Heriot.
• Third Doctor: Jon Pertwee (1970–1974) – companions included Jo Grant and Sarah Jane Smith.
• Fourth Doctor: Tom Baker (1974–1981) – longest‑serving Doctor, 7 seasons.
• Fifth Doctor: Peter Davison (1981–1984).
• Sixth Doctor: Colin Baker (1984–1986).
• Seventh Doctor: Sylvester McCoy (1987–1989).
• Eighth Doctor: Paul McGann (1996 TV movie).
• War Doctor: John Hurt (2013 special).
• Ninth Doctor: Christopher Eccleston (2005).
• Tenth Doctor: David Tennant (2005–2010, plus 2023 specials as Fourteenth).
• Eleventh Doctor: Matt Smith (2010–2013).
• Twelfth Doctor: Peter Capaldi (2014–2017).
• Thirteenth Doctor: Jodie Whittaker (2018–2022).
• Fourteenth Doctor: David Tennant (2023 specials – counted as separate incarnation).
• Fifteenth Doctor: Ncuti Gatwa (2023–present).

Notable regeneration transitions

• Hartnell to Troughton (first ever regeneration, 1966).
• Pertwee to T. Baker (first colour Doctor).
• Eccleston to Tennant (2005 revival, huge ratings boost).
• Tennant to Smith (2010 Christmas special).
• Whittaker to Tennant to Gatwa (2023 specials).

The implication: regeneration allows the show to survive cast changes, but each transition is a gamble for audience retention. The 2023 specials proved that bringing back a popular Doctor can buy goodwill for a new face.

Who are the characters in Dr. Who?

Main companions through the series

• First Doctor: Susan Foreman (Carole Ann Ford), Ian Chesterton (William Russell), Barbara Wright (Jacqueline Hill).
• Second Doctor: Jamie McCrimmon (Frazer Hines), Victoria Waterfield (Deborah Watling), Zoe Heriot (Wendy Padbury).
• Third Doctor: Liz Shaw (Caroline John), Jo Grant (Katy Manning), Sarah Jane Smith (Elisabeth Sladen).
• Fourth/Fifth Doctors: Leela (Louise Jameson), Romana (Mary Tamm/Lalla Ward), Adric (Matthew Waterhouse), Nyssa (Sarah Sutton), Tegan (Janet Fielding).
• Revival era: Rose Tyler (Billie Piper), Martha Jones (Freema Agyeman), Donna Noble (Catherine Tate), Amy Pond (Karen Gillan), Rory Williams (Arthur Darvill), Clara Oswald (Jenna Coleman), Bill Potts (Pearl Mackie), Yasmin Khan (Mandip Gill), Ryan Sinclair (Tosin Cole), Graham O’Brien (Bradley Walsh), Dan Lewis (John Bishop).

Key recurring villains

• The Daleks: The Doctor’s oldest enemies, created by Davros.
• The Cybermen: Cyborgs originally from Mondas, frequent opponents.
• The Master: A renegade Time Lord, played by multiple actors including Roger Delgado, Anthony Ainley, and Sacha Dhawan.
• Other notable foes: The Silence, Weeping Angels, Ice Warriors, Sontarans.

The pattern: the companion‑villain dynamic keeps the series grounded in human stakes across regenerations.

Why was Rose written out of Dr. Who?

Rose Tyler’s departure in “Doomsday”

Rose Tyler, played by Billie Piper, was the first companion of the 2005 revival. In the Series 2 finale “Doomsday,” she was trapped in a parallel universe after closing the void to stop the Daleks and Cybermen. The Doctor could not reach her, making it a permanent separation.

Actress Billie Piper’s decision and impact

Billie Piper chose to leave to pursue other acting opportunities. The showrunner at the time, Russell T Davies, wrote her exit as an emotional climax. According to Davies, it was a heartbreaking but necessary end for her character. Piper later returned for brief cameos in Series 4 and the 50th anniversary special.

What this means: Rose’s exit set a template for how the modern series handles companion departures—emotional, often permanent, but with occasional returns to reward long‑time fans.

Who was the most disliked Dr. Who?

Fan polls and critical reception

No official rank exists, but fan polls and online ratings consistently place Colin Baker (Sixth Doctor) and Jodie Whittaker (Thirteenth Doctor) among the least popular. Baker’s era suffered from behind‑the‑scenes turmoil and a short run (1984–1986). Whittaker faced mixed reviews due to uneven writing during Chris Chibnall’s showrunning.

Factors influencing popularity

• Writing quality and showrunner consistency.
• Performance style: Doctors who are aloof or abrasive tend to rank lower.
• Cultural context: Jodie Whittaker was the first female Doctor, which polarized audiences.
• Nostalgia bias: earlier Doctors often score higher in retrospectives.

The catch: “Most disliked” is highly subjective. A 2023 fan survey on Reddit ranked Colin Baker last, but others defend his era as unfairly maligned.

Why is Ncuti Gatwa no longer the Doctor?

Gatwa’s casting and first season

Ncuti Gatwa was announced as the Fifteenth Doctor in 2022 and made his full debut in the 2023 Christmas special “The Church on Ruby Road.” His first season (Season 14) aired in 2024 to positive reviews. As of 2025, he remains the current Doctor with no official announcement of departure.

Current status and future

Rumors that Gatwa has left are unconfirmed and likely stem from confusion over the 2023 specials, where David Tennant temporarily returned as the Fourteenth Doctor. Gatwa is expected to return for Season 15, which is in production. The question may also arise from online speculation or clickbait headlines.

The implication: Gatwa’s tenure is still young, but the show’s survival depends on managing audience expectations through regeneration.

“It was a heartbreaking but necessary end for her character.” — Russell T Davies, showrunner, on Rose Tyler’s exit

The Flagship Eclipse (Doctor Who companion overview)

“It’s an honor and a responsibility I take very seriously.” — Ncuti Gatwa, actor playing the Doctor

Big Chief Studios (fan reference site)

For a franchise that relies on change, the cast of Doctor Who remains its most valuable asset. Ncuti Gatwa’s Fifteenth Doctor shows that the core of curiosity and compassion remains, giving fans a reason to keep watching across generations.

Frequently asked questions