Thomas the Model Adventures is a model series. This series is narrated by Michael Angelis in UK and Dean Wendt in US.
- Thomas - The smart blue tank engine and the main star of the series.
- Edward - The oldest engine and works at a department with Belle, his girlfriend.
- Henry - The green engine who proves the smartest.
- Gordon - The big blue engine, who's the strongest.
- James - The vain red engine, who likes to cause trouble, along with his brother, Diesel.
- Percy - Thomas' best friend
- Toby - The brown old tram engine
- Duck - The hard-working Great Western tank engine and the second main character.
- Donald & Douglas - The Scottish Twin Engines.
- Oliver - The wise Great Western engine.
- Emily - Thomas' girlfriend.
- Diesel - James' brother and partner, who likes to cause trouble, like James.
- Arry & Bert - The twin diesels.
- Sidney - The forgetful diesel.
- Paxton - The young diesel.
- Dennis and Norman - The twin lazy diesels.
- Daisy - Diesel's girlfriend.
- BoCo - The friendly and good diesel.
- Mavis - The young diesel, like Paxton.
- D261 - The stuck-up diesel and Spud's twin.
- Spud - D261's twin
- Spamcan - D199's twin.
- D199 - Spamcan's twin.
- Diesel 10 - The big bad diesel.
- Splatter & Dodge - Diesel 10's henchmen.
- Diesel 11 - One of Diesel 10's brothers.
- Diesel 12 - One of Diesel 10's brothers.
- Diesel 13 - One of Diesel 10's brothers.
- Diesel 14 - One of Diesel 10's brothers.
- Diesel 15 - One of Diesel 10's brothers.
- Dean Wendt still uses his Barney voice while narrating the US versions of the episodes.
- In the US versions, Patty Wirtz uses BJ's Season 3 voice to suit James.
- In the US versions, all engines have different voice actors, except Emily, Mavis, Rosie and Daisy.
- Michael Angelis as the narrator
- Ben Small as Thomas, Toby, and Ferdinand
- Keith Wickham as Percy, James, Gordon, Henry, Edward, Oliver (GWR), Duncan, Duke, Salty, Harold, Sir Topham Hatt, Dash, Captain, Dowager Hatt, Whiff, Buster, Oliver (Pack) and Mr. Bubbles
- Ringo Starr as Duck, Donald, Douglas, Skarloey, Sir Handel and Rusty
- Matt Wilkinson as Victor, Charlie, Bash, Spencer, Rocky, Cranky, and Kevin
- Teresa Gallagher as Emily, Mavis, Rosie, Daisy, Madge and Lady
- Togo Igawa as Hiro, Proteus
- Kerry Shale as Diesel, Smudger 'Arry, and Bert
- Jules de Jongh as Alicia Botti
- Dean Wendt as the narrator
- Bob West as Thomas
- Ringo Starr as Edward, Gordon, Duck, Donald, Douglas, Oliver and Stanley
- Alec Baldwin as Henry and Toby
- Patty Wirtz as James
- Michael Brandon as Percy
- Jules de Jongh as Emily, Mavis and Rosie.