David Nykl
David Nykl (born 7 February 1967 in Prague, Czechoslovakia) is a Czech Canadian actor of film, television, commercials and theater.
After the Soviet invasion in 1968, he and his family left then-Communist Czechoslovakia for Canada. Upon arriving at Victoria, British Columbia, his father found work as a structural engineer and his mother found work as a nurse.
Nykl attended the University of British Columbia, where he majored in liberal arts.
Nykl has appeared heavily in Vancouver and Prague in dozens of theater, film and television productions. Known for his versatility and depth as an actor, he has also produced theatre and film projects, and in 1994 he co-founded Prague's Misery Loves Company Theatre with Richard Toth and Ewan McLaren.
He is known to science fiction fans as the recurring Stargate Atlantis character of Dr. Radek Zelenka, a Czech scientist on Earth's expedition to the "lost city" of Atlantis. His character often provides a foil to the main scientists, who forget the limits of their situation.
He is fluent in Czech, English, French and Spanish. Though his character on Stargate Atlantis speaks English with a Czech accent, Nykl normally speaks with a Canadian accent. Whenever Zelenka spoke Czech in Stargate Atlantis, Nykl was given the lines in English, and he translated them.
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Known For









Credits
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El Turco 2025Prince Francesco di Paulo★ 7.3
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Clifford Reed★ 7.8
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The Sleepers 2019Gerald Lloyd★ 6.7
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Carnival Row 2019Constable Boggs★ 7.7
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William 2019Principal Bernstein★ 6.2
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The Devout 2015Dr. Fisher★ 6.8
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Minority Report 2015Eli Winford★ 6
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Air 2015Sleeper★ 4.9
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Tomorrowland 2015Science Teacher★ 6.3
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Medical Examiner★ 4.9
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Christmas Miracle 2012Drake★ 5.8
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Arrow 2012Anatoly Knyazev★ 6.8
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Camera Shy 2012Cliff Gardner★ 10
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Continuum 2012Sergei★ 7.5
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Once Upon a Time 2011Fisherman★ 7.4
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Lance★ 7
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Elliot Maine★ 5
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Paoul Moran★ NR
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Helen 2009John★ 6.7
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The Seamstress 2009Donny Plachtt★ 3.9
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Dr. Radek Zelenka★ 9
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Sanctuary 2008Strickland★ 7.2
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Fringe 2008Reverend Marcus★ 8.1
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Eureka 2006Dr. Steven Whiticus★ 7.8
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Psych 2006Events Coordinator★ 7.9
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CSI★ 6.5
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Masters of Horror 2005CSI★ 7.2
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Supernatural 2005Lester Morris★ 8.3
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Pterodactyl 2004Herbert★ 4.4
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Stargate Atlantis 2004Dr. Radek Zelenka★ 8
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Jake 2.0 2003Vasily★ 7
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The Dead Zone 2002Waiter★ 7.2
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Escape Velocity 1999Russel★ 4.4
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Joan of Arc 1999Duke of Luxembourg★ 6.5
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Prague Stories 1999★ 5
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Act of War 1998George Willmont★ 3.2
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Cold Squad 1998★ 6.9
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Prague Duet 1998Glen Hudson★ 5.8
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Stargate SG-1 1997Dr. Radek Zelenka★ 8.3
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Sacred Cargo 1996Brother Alexis★ NR
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Hidden in Silence 1996Henek★ 7.1
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Danger Bay 1985Peter★ 7.2