David Fynn

Actor

Biography

David Fynn is a British-Irish actor, producer and screenwriter, best known for playing Brett in the NBC TV sitcom Undateable. He began playing Dewey Finn in the West End cast of Andrew Lloyd Webber's musical School of Rock (based on the 2003 film with Jack Black) in October 2016 at the New London Theatre, for which he received an Olivier Award nomination for Best Actor in a Musical in 2017.

Acted in 34

2020s

2026
Believe Me
DS Steve Warrilow · 2 episodes
73
Kiloran Bay
Dougal
2025
Watch the Skies
Thor
Harlan Coben's Lazarus
Seth McGovern · 6 episodes
63
2024
Here
Leo Beekman
52
Near Miss
Jim
Daddy Issues
Derek · 6 episodes
69
Belgravia: The Next Chapter
Ross · 8 episodes
71
2023
Trolls Band Together
Biggie (voice)
61
2022
National Theatre Live: Much Ado About Nothing
Dogberry
The Thief, His Wife and the Canoe
David Leigh · 2 episodes
71
2021
The Mauritanian
Kent
70
The Pembrokeshire Murders
Jonathan Hill · 3 episodes
70
2020
Trolls: TrollsTopia
Biggie / Mr. Dinkles (voice), Biggie (voice), Biggie / Mecha Dinkles (voice) · 11 episodes
66
Madagascar: A Little Wild
Sir Braxton (voice) · 1 episode
63
Avenue 5
TV Judd · 6 episodes
67

2010s

2019
Married Young
David
Whiskey Cavalier
Todd · 2 episodes
70
I'd Like to Be Alone Now
Sam
2018
Vanity Fair
Jos Sedley · 7 episodes
73
2014
Undateable
Brett · 34 episodes
71
2013
Big Bad World
Oakley · 8 episodes
The Job Lot
Tyler Kerrigan · 1 episode
2012
The Somnambulists
Man #9
National Theatre Live: She Stoops to Conquer
Tony Lumpkin
Deviation
Justin
33
2011
Black Mirror
Oliver · 1 episode
86
Game of Thrones
Rennick · 1 episode
90
2010
Sherlock
Howard Shilcott · 1 episode
89
Leap Year
Agent
50

2000s

2008
The Inbetweeners
Wolfie · 1 episode
82
2005
Doctor Who
Marcellus · 1 episode
82
2003
Peep Show
Games Shop Assistant · 1 episode
85
2002
Spooks
Policeman at Ruth's House · 1 episode
81