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John Hasler
Born (1974-04-21) 21 April 1974 (age 50)
Barking, London, England
Occupation Actor
Years active 1984–present

John Hasler (born 21 April 1974) is an English actor. He is best known as T-Shirt in the children's television series T-Bag from 1985 to 1992, and for voicing Thomas the Tank Engine in the UK dub of the children's television series Thomas & Friends from 2015 to 2021. Hasler was the only cast member on T-Bag to remain with the show for its entire television run, starting as a young boy and leaving as a teenager. He has a child, Alice.


Hasler began his career in the mid-1980s. He played T-Shirt, a prominent character in the T-Bag TV series, between 1985 and 1992, being the only character to star in all nine series and in all four Christmas specials.

He has appeared in Renford Rejects and Casualty and provided voices and additional dialogue replacement (ADR) for a number of film, radio and television productions. He also appeared for an old TV advert for Persil washing powder in the 1990s.

In 2012, he joined the voice cast of Fireman Sam as James Jones, taking over the role from Steven Kynman and Arnold McKinley.

From August 2012 to February 2015, Hasler was cast in the United Kingdom tour of Disney's The Lion King, performing as the meerkat Timon.

In 2015, he became the replacement voice actor of Thomas the Tank Engine in the UK and Rheneas in the UK and US narrations of Thomas & Friends, after Ben Small left the show. He also voices the lead character Trafalgar on Teenage Fairytale Dropouts, protagonist "Toot" in Toot the Tiny Tugboat and Foz in Go Jetters. Hasler left the Thomas and Friends cast after the show ended in 2021, however he continues to voice Thomas in YouTube shorts.

In 2021, Hasler provided the British English voice of Hugo the Jungle Animal in all three films.



Year Title Role(s) Notes
1984 Breakout Stephen
1998 Vincent and Doug: Let's Do It Vincent Voice
1999 Vincent and Doug: The Movie
2000 Vincent and Doug 2
2011 10 Areans of Marwood Irving Clifford
2012 Brave Additional voices
2014 Fireman Sam: Heroes of the Storm Arnold McKinley, James Jones UK voice
2015 Thomas & Friends: The Adventure Begins Thomas
Thomas & Friends: Sodor's Legend of the Lost Treasure
2016 Thomas & Friends: The Great Race Thomas (UK)
Voice; uncredited in the US
2017 Fireman Sam: Alien Alert Arnold McKinley, James Jones UK voice
Thomas & Friends: Journey Beyond Sodor Thomas
2018 Thomas & Friends: Big World! Big Adventures!


Year Title Role Notes
1985–92 T-Bag T-Shirt 94 episodes
1991 Doctor at the Top Alec 1 episode
1994 Harry's Mad Access Episode: "Mad Macaw"
Against All Odds Paul Cheatle Episode: "The Horse and His Boys"
1994–2002 Vincent and Doug Vincent Voice; 22 episodes
1995 The Legends of Treasure Island Jim Hawkins Voice; 13 episodes (Series 2)
2000 Casualty Lee Carter Episode: "Not Waving But Drowning"
Renford Rejects Jack Episode: "Best Laid Plans"
2002–2004 Heroes Delight Vincent Voice; 10 episodes
2008 Get Squiggling All male characters Voice
2012–present Fireman Sam James Jones, Arnold McKinley Main UK voice role
2013–14 Teenage Fairytale Dropouts Trafalgar Main voice role
2014–2015 Toot the Tiny Tugboat Toot Main voice role; 51 episodes
2015–2021 Thomas & Friends Thomas / Narrator (UK)
Rheneas (US)
Main voice role, succeeding Ben Small
Go Jetters Foz Main voice role
2019–present Think about Lesson Pet Supporting voice role
YooHoo to the Rescue YooHoo UK dub
2019 Thomas & Friends: Steam Team to the Rescue Thomas / Narrator (UK) Main voice role
Thomas & Friends: Digs and Discoveries (All Tracks Lead to Rome / Mines of Mystery)
Robozuna Zeve, Superfan, Dr Naron 1 episode
2020 Thomas & Friends: The Royal Engine Thomas / Narrator (UK) Main voice role

Video games

Year Title Role Notes
1998 Vincent and Doug: The Video Game Vincent Voice
1999 Vincent and Doug: The Movie Game Voice
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