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The 60th anniversary special "Doctor Who: Once and Future" will see actors Tom Baker, Peter Davison, Colin Baker, Sylvester McCoy, Paul McGann, Christopher Eccleston, and David Tennant in an eight-part event to celebrate the series.
William Hartnell was the first actor to portray the famous time-travelling hero back in 1963.
His version of the Doctor was an abrasive, stubborn, old man who eventually learned to trust humans.
He travelled across time until 1963, when he passed on the role to the next actor.
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Patrick Troughton took over the reins from Hartnell and played the Doctor from 1966 - 1969.
Much of his episodes were lost and have been recreated in cartoons in 2016.
The second Doctor was a scruffy, lighthearted character nicknamed the Cosmic Hobo.
Jon Pertwee played the third Doctor with a dapper air from 1970 - 1974.
His character was quicker to action compared to his predecessors and was stranded on Earth for the beginning of his run.
Known for his colourful knitted scarf, Tom Baker's doctor whimsically traipsed through time from 1974 - 1981.
He was much warmer than previously and was also quick to anger.
Baker played the role for seven consecutive seasons, making him the actor to play the Doctor the longest.
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Peter Davison played the fifth Doctor with a boyish charm and vulnerability from 1981 - 1984.
His character's signature outfit consisted of an Edwardian cricketer outfit.
Colin Baker set himself apart from his predecessors with his brash and patronizing sixth Doctor.
While he had appeared in the series in a different role previously, he took over as the Doctor from 1984 - 1986.
Baker dressed in a brightly coloured suit of mismatching patterns during his run.
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Sylvester McCoy played the seventh and final doctor of the original "Doctor Who" series.
His whimsical doctor became more layered and manipulative during his run from 1987 - 1989.
While the series became cancelled after this season, the story continued in novels.
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It wasn't until 1996 that "Doctor Who" would return to television with a TV movie with Paul McGann in the titular role.
The film served as a back-door pilot for the series and so only saw McGann on television in the role in 1996.
He would go on to reprise the role in radio dramas throughout the years and even have brief cameos in future episodes.
McGann's eighth doctor was eccentric and passionate.
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Christopher Eccleston brought the Doctor back to television in the first season since 1989 with his traumatized, but righteous ninth Doctor.
The actor only played the role for a little over 2 months from March to June 2005, but is frequently cited as one of the most iconic doctors.
His signature outfit included a black, leather, trench coat.
David Tennant's tenure as the tenth Doctor was met with wild fan fervor, with his incarnation frequently being cited as the most iconic.
His bespectacled Doctor travelled through time with an eccentric and charming air.
Tennant appeared on the show from 2005 - 2010, but would return to the show in 2022 for an unprecedented second run.
Matt Smith's eleventh Doctor has drawn praise from fans and critics alike as he travelled across time and space from 2010 - 2013.
His doctor was compassionate and quick-tempered with a world-weary air.
Smith's Doctor was known for his signature red bowtie and tweed jacket.
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Series veteran Peter Capaldi took over the role from Smith, after previously appearing in the tenth Doctor's season as well as in the spin-off "Torchwood" series.
Capaldi played the brusque and pragmatic twelfth Doctor from 2013 - 2017.
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Jodie Whittaker's turn as the thirteen Doctor would mark the first time in the series the Doctor regenerated into a woman.
She played the light-hearted Doctor with a sense of adventure and passion for non-violent solutions from 2017 - 2022.
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Ncuti Gatwa was originally announced to take over the role after Whittaker as the fourteenth Doctor, but fans were surprised when Whittaker regenerated into the familiar tenth Doctor instead.
Showrunner Russell T. Davies revealed Gatwa would instead take over as the fifteenth Doctor.
The actor's expected portrayal of the Doctor will mark the first time the time traveler has been played by a non-white actor.