Colin Baker, Sylvester McCoy, Paul McGann, David Bradley interactive online panel Sun 5 9 21

Colin Baker (born 8 June 1943) is an English actor who played Paul Merroney in the BBC drama series The Brothers from 1974 to 1976 and the sixth incarnation of the Doctor in the long-running science fiction television series Doctor Who from 1984 to 1986. Baker's tenure as the Doctor proved to be a controversial era for the series, which included a hiatus in production and his subsequent replacement on the orders of BBC executive Michael Grade. Sylvester McCoy (born Percy James Patrick Kent-Smith; 20 August 1943) is a Scottish actor and physical comedian.[1] He is best known for playing the seventh incarnation of the Doctor in the long-running science fiction television series Doctor Who from 1987 to 1989—the final Doctor of the original run—and briefly returning in a television film in 1996. He is also known for his work as Radagast in The Hobbit film series (2012—2014). Paul John McGann (born 14 November 1959) is an English actor. He came to prominence for portraying Percy Toplis in the television serial The Monocled Mutineer (1986), then starred in the dark comedy Withnail and I (1987), which was a critical success and developed a cult following. McGann later became more widely known for portraying the eighth incarnation of the Doctor in the 1996 Doctor Who television film. He is also known for playing Lieutenant William Bush in the series Hornblower. David John Bradley (born 17 April 1942) is an English actor. He is known for playing Argus Filch in the Harry Potter film series, Walder Frey in the HBO fantasy series Game of Thrones, Abraham Setrakian in the FX horror series The Strain, and Merlin in Guillermo del Toro’s animated Netflix series Tales of Arcadia (for which he won an Annie Award for Best Voice Actor in a Television Series.) He is also an established stage actor, with a career that includes a Laurence Olivier Award for his role in a production of King Lear. Other acting credits include the BBC Two series Our Friends in the North, the ITV series Broadchurch (for which he won the Best Supporting Actor award at the 2014 British Academy Television Awards), the BBC One miniseries Les Misérables, the comedy series After Life and the films Hot Fuzz, The World's End and Captain America: The First Avenger. In 2012, Bradley played Solomon in the Doctor Who episode "Dinosaurs on a Spaceship". In 2013, Bradley portrayed William Hartnell, the actor who played the First Doctor, in the Doctor Who docudrama An Adventure in Space and Time. He returned to Doctor Who in 2017, appearing as the First Doctor in "The Doctor Falls" and "Twice Upon a Time". Since January 2018, Bradley has reprised the role in a series of audio stories released by Big Finish entitled The First Doctor Adventures.