Teresa Gallagher is an American-born British actress, voice actress, and singer who is known for her roles in several animated television shows, such as Nicole Watterson, Margaret Robinson, Penny Fitzgerald, and various characters in The Amazing World of Gumball; Annie, Clarabel, Emily, Rosie, Mavis, Gina, Frieda, and numerous characters in Thomas & Friends; Egbert and Gilda in Poppy Cat; EOS and various guest characters in Thunderbirds Are Go; Elias and Helinor in Elias: Rescue Team Adventures; and the Tiddlytubbies in the 2015 reboot of Teletubbies.
For Disney, she voiced Mater's computer in Disney/Pixar's Cars 2 and its video game; the titular character in the U.K. version of Henry Hugglemonster; Dashi in the Disney Junior British series The Octonauts; and Jessica Wright, Mallory, and Lolo Calorie in the Disney XD British/French series Dude, That's My Ghost!.
Thomas and Friends: The Adventure Begins
Annie and Clarabel, Judy, The Passengers (voice)
2015
The Amazing World of Gumball: The Movie!
Nicole Watterson / Penny / Margaret Robinson (voice)
The Wonderfully Weird World of Gumball
Nicole Watterson (voice) · (1 episode)
2025
Isadora Moon
(12 episodes)
2023
The Octonauts & the Great Summer Adventure
Dashi (voice)
2023
Incredible Ant
Unity (voice) · (1 episode)
2022
The Creature Cases
(voice) · (23 episodes)
2022
Elliott from Earth
(16 episodes)
2021
Octonauts and the Ring of Fire
Dashi (voice)
2021
Octonauts and the Great Barrier Reef
Dashi (Voice)
2020
Octonauts and the Caves of Sac Actun
Dashi/Ryla (Voice)
2020
JoJo & Gran Gran
Cynthia · (127 episodes)
2020
Thomas & Friends: Big World! Big Adventures! The Movie
Emily / Arizona Diesel / Annie and Clarabel / Rio Crane (voice)
2018
Thomas & Friends: Big World! Big Adventures! The Movie
Marion / Natalie / Arizona Diesel / Annie & Clarabel / Rio Crane (voice)
2018
Thomas & Friends: Journey Beyond Sodor - The Movie
Emily (UK), Annie and Clarabel (UK & US) (voice)
2017
Thomas & Friends: Extraordinary Engines
Annie and Clarabel / Judy / The Duchess of Boxford / Stephen Hatt / Bridget Hatt (voice)
2017
Magiki
Billie · (52 episodes)
2017
Octonauts - 15 Underwater Adventures
Dashi
2016
Thomas & Friends: Full Steam To The Rescue!
Emily (UK) / Belle (UK & US) / Annie and Clarabel (UK & US) / Albert's Wife (UK & US) (voice)
2016
Thomas & Friends: Tinsel on the Tracks
Annie / Clarabel / Passenger (voice)
2016
Thomas & Friends: The Great Race
Various (voice)
2016
Thomas & Friends: Tales on the Rails
Annie (voice) / Clarabel (voice)
2015
Thomas & Friends: Sodor's Legend of the Lost Treasure: The Movie
Emily / Daisy / Annie / Clarabel (voice)
2015
Thomas & Friends: Whale of a Tale and Other Sodor Adventures
Belle (UK & US) / Annie and Clarabel (UK & US) / Stephen Hatt (UK & US) / Bridget Hatt (UK & US) / Passengers (UK & US) (voice)
2015
Thunderbirds Are Go!
EOS (voice) · (78 episodes)
2015
Daddy Christmas
2014
Ronja the Robber's Daughter
Ronja (voice, English version) · (26 episodes)
2014
Mike the Knight: Journey to Dragon Mountain
2014
Thomas & Friends: Tale of the Brave: The Movie
Emily / Annie / Clarabel (voice)
2014
Postman Pat: The Movie
Lucy Selby (voice)
2014
Thomas & Friends: Trouble on the Tracks
Mavis (UK & US) / Annie and Clarabel (UK & US) (voice)
2014
Thomas & Friends: Spills & Thrills
Mavis / Annie & Clarabel / Lady Hatt (voice)
2014
Fink
Jake
2013
Thomas & Friends: Santa's Little Engine
Annie and Clarabel (UK & US) (voice)
2013
Thomas & Friends: King of the Railway
Emily / Belle / Annie and Clarabel (voice)
2013
The Jungle Book: Return 2 the Jungle
2013
The Jungle Book: The Movie
Darzi
2013
Fleabag Monkeyface
(52 episodes)
2011
Thomas & Friends: Day of the Diesels - The Movie
Emily / Belle / Mavis / Lady Hatt (voice)
2011
Cars 2
Mater's Computer (voice)
2011
The Amazing World of Gumball
Nicole Watterson (voice) · (266 episodes)
2011
Poppy Cat
Egbert (voice) · (104 episodes)
2011
Mr Bloom's Nursery
(72 episodes)
2011
The King's Speech
Nurse
2010
Thomas & Friends: Misty Island Rescue
Emily (voice)
2010
Rainbow Magic: Return to Rainspell Island
Mrs. Walker / Queen Titania / Fern (Voice)
2010
Thomas & Friends: Hero of the Rails - The Movie
Emily / Mavis / The Duchess Of Boxford (voice)
2009
Noddy in Toyland
(52 episodes)
2009
Get Squiggling!
(76 episodes)
2008
Frankenstein's Cat
Sweeny · (28 episodes)
2007
Mama Mirabelle's Home Movies
Karla (voice) · (26 episodes)
2007
A Christmas Carol
Tiny Tim / Ghost of Christmas Past / Fan (voice)
2006
The Jacket
Nurse Sally
2005
Footballers' Wives
Sarah Mortimer · (1 episode)
2002
Footballers' Wives
Sarah · (1 episode)
2002
Topsy-Turvy
Miss Coleford
1999
The Misadventures of Margaret
Astronaught #2
1998
Thomas & Friends
Emily / Rosie / Mavis (voice) · (20 episodes)
1984