Jules de Jongh (born in California) is a British-based American actress who provides voices for most of the female characters in the US version of Thomas & Friends.
Jules provides voices in other shows such as Viki and Marco in the US version of "Angelina Ballerina" as well as Lieutenant Green in Gerry Anderson's 2005 reboot of his 1968 series "Captain Scarlet". She also provides voices in video games such as "Burnout", "Need for Speed", "Moon Tycoon", "Killzone", and "Lego City Undercover".
She has narrated several productions for Channel Five in the UK.
- Mavis (Hero of the Rails - Blue Mountain Mystery)
- Lady Hatt
- Bridget Hatt (thirteenth and fourteenth season only)
- The Duchess of Boxford (Hero of the Rails - sixteenth season)
- Bridget Hatt's friends
- The Teacher
- The Laundry Lady
- The School Children
- The Blond-haired Boy (fifteenth season onwards)
- Some Children (Diesel's Special Delivery, Gordon and Ferdinand, Steamie Stafford, Emily Saves the World and Sodor's Legend of the Lost Treasure)
- Both she and Ben Small voiced characters from "The Haunted Pumpkin of Sleepy Hollow".
- Both she and Teresa Gallagher voiced characters from "Mama Mirabelle's Home Movies".
- She and Nigel Plaskitt worked together on "New Captain Scarlet".
- She, along with Kerry Shale and David Holt voiced characters in "Puppeteer".
- She, Kerry Shale, David Menkin, and Joseph May voiced the DC characters from "LittleBigPlanet 2".
- In addition, she and Shale have provided voices in "Lego Ninjago: Nindroids" and "Shadow of Ronin".
- Both she and Keiko Toda voiced Kate from "Hot Shots Golf: Out of Bounds" in their respective languages.
- Both she and Irwin Daayán voiced Marco from "Angelina Ballerina: The Next Steps" in their respective languages.