O'Brien grew up in nearby Royton and was educated at the Bishop Henshaw Roman Catholic Memorial High School in Rochdale. He began acting at an early age and was the star of a BBC TV series Gruey by the time he was 15. He also featured in several other series at the time in one-off or recurring roles ... . In 1993, he played the role of Craig Lee in Coronation Street and then the role of Lee Jones in Children's Ward. In 1993 he also became a regular in the detective series, Cracker, playing Mark, the son of central character Robbie Coltrane. In 1999 he made his cinema debut with the film Virtual Sexuality and began a reunited with Cracker director Michael Winterbottom for 24 Hour Party People in 2002 and, in '04, for the controversial 9 Songs, which included scenes of genuine sexual intercourse between O'Brien and his leading lady Margo Stilley. His role had earned him the credit of being the only mainstream British actor who has been shown ejaculating in a mainstream UK-produced feature. Since 9 Songs, O'Brien has made two further films with Winterbottom; A Cock and Bull Story and The Look of Love. Recent regular TV roles include Holby Blue and The Syndicate.
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| Organization | Category | Movie |
|---|
Burn It
as Andy Grimshaw
Episodes: 21
First Aired: Feb 08, 2003
Holby Blue
as Constable Robert Clifton
Episodes: 20
First Aired: May 08, 2007
Cracker
as Mark Fitzgerald
Episodes: 14
First Aired: Sep 27, 1993
Children's Ward
as Lee Jones
Episodes: 13
First Aired: Mar 15, 1989
Glue
as Thomas Bray
Episodes: 8
First Aired: Sep 15, 2014
The Family Pile
as Stuart
Episodes: 6
First Aired: Jan 17, 2023
The Last Enemy
as Wafa
Episodes: 5
First Aired: Feb 17, 2008
Cracker
as Mark
Episodes: 5
First Aired: Sep 27, 1993
Ted Lasso
as James Tartt
Episodes: 5
First Aired: Aug 14, 2020
Messiah
as Eric Metcalfe
Episodes: 4
First Aired: May 26, 2001
In the Dark
as DS Gary Kenny
Episodes: 4
First Aired: Jul 11, 2017
Love Life
as Dez
Episodes: 3
First Aired: Mar 15, 2012
Prey
as Phil Prentice
Episodes: 3
First Aired: Apr 28, 2014
Star Wars: Andor
as Pegla
Episodes: 3
First Aired: Sep 21, 2022
Blue Murder
as Terry Camerton
Episodes: 2
First Aired: May 18, 2003
Bluestone 42
as Nutsack
Episodes: 2
First Aired: Mar 05, 2013
Jason and the Argonauts
as Actor
Episodes: 2
First Aired: May 07, 2000
Years and Years
as Woody
Episodes: 2
First Aired: May 14, 2019
Bloodlines
as Mark Hopkin
Episodes: 2
First Aired: Jan 31, 2005
Heartbeat
as Neil
Episodes: 1
First Aired: Apr 10, 1992
Band of Brothers
as Allen Vest
Episodes: 1
First Aired: Sep 09, 2001
Life on Mars
as Davie Mackay
Episodes: 1
First Aired: Jan 09, 2006
New Tricks
as Michael Jacobs
Episodes: 1
First Aired: Jan 01, 2004
Cuckoo
as Goran
Episodes: 1
First Aired: Sep 25, 2012
Vera
as Bobby Salter
Episodes: 1
First Aired: May 01, 2011
Moving On
as Shane
Episodes: 1
First Aired: May 18, 2009
Secret Diary of a Call Girl
as Al
Episodes: 1
First Aired: Sep 27, 2007
Casualty
as Chris Miller
Episodes: 1
First Aired: Sep 06, 1986
Casualty
as Billy
Episodes: 1
First Aired: Sep 06, 1986
The Afternoon Play
as Sean Tyler
Episodes: 1
First Aired: Jan 27, 2003
Chernobyl
as Khodemchuck
Episodes: 1
First Aired: May 06, 2019
Death in Paradise
as Danny
Episodes: 1
First Aired: Oct 25, 2011
Trucking Hell
Episodes: 129
First Aired: May 17, 2018
The Cars That Made the World
as Self - Narrator
Episodes: 4
First Aired: Nov 28, 2020
Dramarama
Episodes: 1
First Aired: Sep 12, 1983
The Terry and Gaby Show
Episodes: 1
First Aired: Jun 02, 2003
Dalziel & Pascoe
Episodes: 1
First Aired: Mar 16, 1996
Indie Sex
as Self
Episodes: 1
First Aired: Aug 01, 2007
Cracker
Episodes: 0
First Aired: Sep 27, 1993
Popularity History
| Year | Month | Avg | Max | Min |
|---|---|---|---|---|
| 2024 | 6 | 12 | 20 | 7 |
| 2024 | 7 | 15 | 22 | 7 |
| 2024 | 8 | 13 | 34 | 6 |
| 2024 | 9 | 10 | 16 | 4 |
| 2024 | 10 | 9 | 15 | 4 |
| 2024 | 11 | 6 | 10 | 3 |
| 2024 | 12 | 7 | 12 | 5 |
| 2025 | 1 | 9 | 16 | 4 |
| 2025 | 2 | 7 | 15 | 1 |
| 2025 | 3 | 6 | 11 | 1 |
| 2025 | 4 | 1 | 1 | 1 |
| 2025 | 5 | 2 | 2 | 1 |
| 2025 | 6 | 1 | 1 | 1 |
| 2025 | 7 | 0 | 1 | 0 |
| 2025 | 8 | 1 | 2 | 0 |