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- Daniel Kaluuya
- Barclay, "Planet of the Dead" (2009)
- John Kane
- Tommy, Planet of the Spiders (1974)
- Paul Kasey
- Auton, "Rose" (2005)
- Lute of Forest of Cheem, "The End of the World" (2005)
- Karen Gillian ( Amy Pond )
- Slitheen, "Aliens of London" - "World War Three" (2005)
- Trine-E and Zu-Zana, "Bad Wolf" (2005)
- The Anne Droid, "Bad Wolf" - "The Parting of the Ways" (2005)
- Clockwork Man, "The Girl in the Fireplace" (2006)
- Various Cybermen, "Rise of the Cybermen" - "The Age of Steel" and "Army of Ghosts" - "Doomsday" (2006), "The Next Doctor" (2008)
- Various Ood, "The Impossible Planet" - "The Satan Pit" (2006), "Planet of the Ood" (2008)
- The Hoix, "Love & Monsters" (2006)
- Robot Santas, "The Runaway Bride" (2006)
- Judoon, "Smith and Jones" (2007), "The Stolen Earth" (2008)
- Pig Slave, "Daleks in Manhattan" - "Evolution of the Daleks" (2007)
- The Host, "Voyage of the Damned" (2007)
- Hath Peck, "The Doctor's Daughter" (2008)
- Bernard Kay
- Carl Tyler, The Dalek Invasion of Earth (1964)
- Saladin, The Crusade (1965)
- Crossland, The Faceless Ones (1967)
- Caldwell, Colony in Space (1971)
- Peter Kay
- Victor Kennedy/Abzorbaloff, "Love & Monsters" (2006)
- Stubby Kaye
- Weismuller, Delta and the Bannermen (1987)
- Michael Keating
- Goudry, The Sun Makers (1977)
- Dean Lennox Kelly
- William Shakespeare, "The Shakespeare Code" (2007)
- Tom Kelly
- Guard, The Face of Evil (1977)
- Guard, The Sun Makers (1977)
- Vardan, The Invasion of Time (1978)
- Edward Kelsey
- Slave Buyer, The Romans (1965)
- Resno, The Power of the Daleks (1966)
- Edu, The Creature from the Pit (1979)
- Sarah Kemp
- UNIT Radio Operator, Day of the Daleks (1972)
- Felicity Kendal
- Lady Clemency Eddison, "The Unicorn and the Wasp" (2008)
- Cavan Kendall
- Achilles, The Myth Makers (1965)
- Kenneth Kendall
- TV Newsreader (Himself), The War Machines (1966)
- Bill Kerr
- Giles Kent, The Enemy of the World (1967/1968)
- Michael Kilgarriff
- Cyberman Controller, The Tomb of the Cybermen (1967)
- Second Ogron, Frontier in Space (1973)
- Robot, Robot (1974/1975)
- Cyber Controller, Attack of the Cybermen (1985)
- Martin King
- The Examiner, The Power of the Daleks (1966)
- Barbara Kinghorn
- Timmin, The Caves of Androzani (1984)
- Alex Kingston
- River Song, "Silence in the Library"-"Forest of the Dead" (2008), "The Time of Angels"-"Flesh and Stone" (2010) "The Pandorica Opens"-"The Big Bang"(2010) "The Impossible Astronaut-"Day of the Moon(2011)
- Dervla Kirwan
- Miss Hartigan, "The Next Doctor" (2008)
- Gertan Klauber
- Galley Master, The Romans (1965)
- Ola, The Macra Terror (1967)
- Esmond Knight
- Dom Issigri, The Space Pirates (1969)
- Tommy Knight
- Luke Smith, "The Stolen Earth"-"Journey's End" (2008), "The End of Time" (2010)
- Burt Kwouk
- Lin Futu, Four to Doomsday (1982)
Read more about this topic: List Of Doctor Who Cast Members