Teresa Gallagher is an American-born British voice actress for The Amazing World of Gumball. She is the voice of Nicole, Penny, Mrs. Robinson, Jackie, Teri, Penny's Sister, the School Nurse, and Siciliana.
- While she does put up a great American accent in her role, Gallagher's native accent has slipped twice in "The Gi," "The Mothers," once in "The Job," including various other times, usually when she says the word "anything."
- She voices the titular protagonist of Disney Junior's Henry Hugglemonster with her usual British accent.
- She did however also use an American accent for Disney XD's Dude, That's My Ghost!.
- She voices various female characters, including Emily, Rosie, Mavis, Belle, Lady Hatt, Annie, and Clarabel in the UK and US dubs of Thomas and Friends.
- She voices the Tiddlytubbies in the 2015 revival of Teletubbies.
- She, Kerry Shale and Rupert Degas have provided voices for the British television show, Thomas & Friends.