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 has a great American voice, Gallagher's 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.