David Ian Hewlett (born 18 April 1968) is a British-born Canadian actor, writer and director, known for his role as Dr. Rodney McKay in the Stargate science-fiction franchise. He first gained fame for his roles as Grant Jansky in the Canadian TV series Traders (1996–2000) and as David Worth in the Canadian psychological horror film Cube (1997). He appeared in the horror film Pin (1988) and the science-fiction films (1991) and Rise of the Planet of the Apes (2011).
Before his acting career took off, Hewlett ran Darkyl Media, a website design firm, and also founded Fusefilm.com, a now-defunct internet community for filmmakers.
Hewlett, an avid science fiction fan, has been quoted saying that Doctor Who, a sci-fi program made in his native Britain, is what first sparked his love for the genre, and that he made science fiction with his friends when he was younger in Britain, on his 8 mm camera. Hewlett had his early dreams of working in science fiction made into a reality when he first had a four-episode guest role on the Canadian/American sci-fi series Stargate SG-1 as the Stargate expert Rodney McKay, which eventually grew into his starring role on Stargate Atlantis.
In 2007, Hewlett appeared as a guest star in the first episode of the TV series Sanctuary, a show produced by and starring Stargate actress Amanda Tapping. He played Larry Tolson, a patient suffering from a form of psychosis who is shot and wounded before being taken into police custody as a murder suspect.
In 2006, he wrote and directed A Dog's Breakfast starring himself, his sister Kate Hewlett, his dog Mars, and his Stargate Atlantis costars Paul McGillion, Christopher Judge and Rachel Luttrell. On 23 July 2006, Hewlett created a YouTube channel named Fanatical.
In 2014, Hewlett directed the supernatural horror-science fiction film Debug with Jason Momoa, who had starred alongside Hewlett in Stargate Atlantis. Jeananne Goossen and Adrian Holmes played the lead roles in the film.
In 2015, Hewlett appeared in the Syfy Channel TV series Dark Matter, which is based on the comic book of the same name. He played a recurring role as Tabor Calchek, a merchant who also serves as the team's handler. Hewlett continues his interest in filmmaking.
In 2017, he made "HEWLOGRAM," a sci-fi comedy short showcasing the filmmaking and special effects tools of Red Giant.
| 1987 | The Darkside | Chuckie | |
| 1988 | Pin | Leon | |
| 1989 | The Penthouse | Joe Dobson | TV film |
| Dead Meat | |||
| 1990 | Where the Heart Is | Jimmy | |
| Deep Sleep | Terry | ||
| Desire and Hell at Sunset Motel | Deadpan Winchester | ||
| 1991 | David Kellum | ||
| The First Circle | 'Ruska' Rostislav | TV film | |
| 1992 | A Savage Christmas: The Fall of Hong Kong | Walter Jenkins | |
| Quiet Killer | Myles Chapman | ||
| Split Images | Gary Hammond | TV film | |
| 1993 | Blood Brothers | Detective Trayne | |
| Steven Lunney, age 25 | |||
| 1996 | Joe's Wedding | Rob Fitzgerald | |
| 1997 | Cube | David Worth, the Architect | |
| On the 2nd Day of Christmas | Mel | TV film | |
| Elevated | Hank | Short | |
| Bad Day on the Block | Andrew | ||
| 1998 | Clutch | Martyn | |
| Milkman | Martin/Soldier's | Voice | |
| 1999 | Survivor | Le médecin | TV film |
| The Life Before This | Nick | ||
| Blind | The Victim | Short | |
| Autoerotica | Gord | ||
| Amateur Night | D.J. | ||
| 2001 | Chasing Cain | Bud | |
| And Never Let Her Go | Gerry Capano | TV film | |
| The Triangle | Gus Gruber | ||
| Century Hotel | Michael | ||
| Treed Murray | Murray | aka Get Down | |
| 2002 | Made In Canada, Volume 1: Best of the CFC | Himself | |
| Cypher | Virgil Dunn | ||
| Father Lefty | Father Gregory | TV film | |
| 2003 | Nothing | Dave | Story writer |
| Foolproof | Lawrence Yeager | ||
| Friday Night | Roger | Short | |
| 2004 | Boa vs. Python | Dr. Steven Emmett | |
| Ice Men | Bryan | ||
| Darklight | Anders Raeborne | TV film | |
| 2006 | A Dog's Breakfast | Patrick | Director and story writer |
| 2008 | Helen | Frank | |
| 2009 | Splice | William Barlow | |
| 2010 | The Whistleblower | Fred Murray | |
| 2011 | Rise of the Planet of the Apes | Hunsiker | |
| Morlocks | Dr. Radnor | TV film | |
| Rage of the Yeti | Mills | Director | |
| 2013 | Haunter | Olivia's Father | |
| 2014 | Debug | — | Director |
| 2017 | The Shape of Water | Fleming | |
| 2019 | Midway | Husband E. Kimmel | |
| Lie Exposed | Brian | ||
| 2021 | Nightmare Alley | Dr. Elrood | |
| 2022 | The Swearing Jar | Bill | |
| 2024 | A Thousand Cuts | ||
| Levels | Oliver |
| 1984 | The Edison Twins | Howard | Episode: "The Delinquent" |
| 1988 | Cal | Episode: "Tales of the Undead" | |
| My Secret Identity | Rock | Episode: "A Walk on the Wild Side" | |
| 1987 | Night Heat | Gil | Episode: "Simon Says" |
| 1988–1989 | T. and T. | Detective Jones/Ronnie | Episodes: "Black and White" & "Thicker Than White" |
| 1990 | The Campbells | Captain HendersonNed Kane | Episodes: "And in the Spring" & "Live by the Sword" |
| 1988–1994 | Street Legal | Dave ListerTim Woolrich | Episodes: "Murder by Video" & "Persons Living or Dead" |
| 1991–1992 | Katts and Dog | The Strangler | 3 episodes |
| 1992 | Forever Knight | Matthew Reed | Episode: "Dead Air" |
| 1992–1993 | Beyond Reality | Tom | 2 episodes |
| 1993 | Shining Time Station | Ted Typo | |
| Tropical Heat (AKA Sweating Bullets) | Gleason | Episode: "Object of Desire" | |
| 1993–1996 | Dr. Nicholas Elder | 13 episodes | |
| 1994 | Monster Force | Lance McGruder (voice) | |
| 1996–2000 | Traders | Grant Jansky | 73 episodes |
| 1999 | Twice in a Lifetime | Mr. Green | Episode: "O'er the Ramparts We Watched" |
| 2001 | ER | Mr. Schudy | Episode: "Never Say Never" |
| 2001–2007 | Stargate SG-1 | Dr. Rodney McKay | 7 episodes |
| 2003 | Mutant X | Hector Friemark | Episode: "The Taking of Crows" |
| 2004 | Without a Trace | Fred Watkins | Episode: "Hawks and Handsaws" |
| The District | Frederick | Episode: "Family Values" | |
| 2004–2009 | Dr. Rodney McKay | 100 episodes | |
| 2009 | The Closer | FBI Special Agent Jerry Moore | Episode: "Walking Back the Cat" |
| 2010–2011 | Hellcats | Dr. Thurston Eagan | 2 episodes |
| 2011 | Dr. Rodney McKay | Episode: "Seizure" | |
| 2013 | Darknet | Lewis | Episode: "Darknet 1" |
| State of Syn | Aslin Kane | 6 episodes | |
| 2015–2016 | Dark Matter | Talbor Calchek | 4 episodes |
| 2016 | Suits | Nathan Burnes | Episode: "Back on the Map" |
| Incorporated | Chad Peterson | 4 episodes | |
| 2016–2017 | Murdoch Mysteries | Dilbert Dilton | 2 episodes |
| 2019 | Hudson & Rex | Nelson Dwyer | Episode: "Man of Consequence" |
| 2021 | Clarice | Anthony Herman | 5 episodes |
| Departure | Bill Ratch | Recurring role (season 2) | |
| Private Eyes | Earl Baer | Episode: "Drop Dead Carny" | |
| 2021–2022 | See | Tormada | Guest role (season 2), main role (season 3) |
| 2022 | Guillermo del Toro's Cabinet of Curiosities | Masson | Episode: "Graveyard Rats" |
| 2025 | Mistletoe Murders | Ray |
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