John Hasler (born in Barking, London, England, UK on 21 April 1974) is an English actor and voice actor who joined the English voice cast of Thomas & Friends in The Adventure Begins. He took over the roles of Thomas and Rheneas from Ben Small.
Hasler is best known for his appearance as T-Shirt in the children's TV series T-Bag. Other credits include "Gnomeo and Juliet" (animated by Arc Productions), "Toot the Tiny Tugboat", "Go Jetters", "The Legends of Treasure Island", and two of HiT Entertainment's other shows; "Mike the Knight" and "Fireman Sam".
- Thomas (The Adventure Begins onwards)
- Never Overlook a Little Engine (performed)
- We Wish You a Merry Christmas (performed)
- Will You Won't You (performed)
- Streamlining (performed)
- You Can Only Be You (performed)
- Be Who You Are, and Go Far (performed)
- Who's Thomas? (performed)
- The Hottest Place in Town (performed)
- I Want To Go Home (performed solo)
- The Most Important Thing is Being Friends (performed)
- Where in the World is Thomas? (performed)
- Wake Up (performed)
- Sometimes You Make a Friend (performed)
- We're Friends (performed)
- John and his family attended the Blue Carpet premiere events of Sodor's Legend of the Lost Treasure on 12 July 2015 and The Great Race on 22 May 2016.