Series 24 of Thomas & Friends: Big World! Big Adventures! will begin airing on Netflix (US) in May 2020, and on Milkshake! (UK) and ABC Kids (Australia) in September 2020.


Mattel green-lit a new series and several specials for Thomas & Friends that will premiere in 2020 to celebrate the 75th anniversary of the franchise. Production will consist of 21 x 11-minute episodes as well as three 22-minute specials following the recent revamp of the series.

David Stoten was announced as the new head writer for the series, succeeding Andrew Brenner. This is also marks the final series animated by Jam Filled Toronto.


Currently Unknown Production Order

Double Length Episodes

  1. Thomas and the Royal Engine
  2. A New Arrival
  3. World of Tomorrow


Main Cast

Additional Cast

Characters Introduced


UK and AUS


  • Joseph May as Thomas
  • Kerry Shale as Gordon, Henry, Diesel and Harold
  • Rob Rackstraw as James, Owen, Fergus Duncan, The Thin Clergyman, Bernie and the Elephant Carer
  • Christopher Ragland as Percy
  • Jules de Jongh as Emily
  • Yvonne Grundy as Nia
  • Rachael Louise Miller as Rebecca and Dr. Hetty
  • William Hope as Edward, Toby, Rocky and Farmer McColl
  • Nicola Stapleton as Rosie and some Children
  • Steven Kynman as Duck and Peter Sam
  • Lucy Montgomery as Marion
  • Tina Desai as Ashima
  • Anna Francolini as Gina
  • Shane Jacobson as Shane
  • Dan Li as Yong Bao and the Chinese Railway Inspector
  • Rose Robinson as Tamika
  • Vincenzo Nicoli as Lorenzo and Beppe
  • Rosamund Pike as Duchess
  • Tracy-Ann Oberman as Daisy
  • Keith Wickham as Harvey, Salty, Skarloey, Sir Handel, Bert, Bertie, Sir Topham Hatt, Mr. Percival, Albert and the Safety Inspector
  • Rasmus Hardiker as Bill and Philip
  • Matt Wilkinson as Ben, Rusty, Merrick and Headkeeper Jack
  • Sanjeev Bhaskar as Shankar
  • David Bedella as Victor
  • Tom Stourton as Stepney, Terence, Rex and Tom Tipper
  • Tim Whitnall as Mike and Reg
  • Togo Igawa as Hiro
  • Matt McCooey as Kenji
  • Teresa Gallagher as Belle, Annie and Clarabel
  • Joe Swash as Sonny
  • Maggie Ollerenshaw as Henrietta
  • Genevieve McCarthy as Aubrey
  • Tim Bain as Aiden
  • Colin McFarlane as Bulgy, Beresford and Dr. Holyfield
  • Jim Howick as George
  • Peter Andre as Ace
  • Flaminia Cinque as Ester
  • Glenn Wrage as Cranky
  • Jamie Campbell Bower as Skiff
  • Windson Liong as Lei
  • Mike Grady as Sir Robert Norramby
  • Montserrat Lombard as Mia
  • Dominique Moore as Ruth
  • Bob Golding as Baz
  • Siu-see Hung as Dr. Kim
  • Chris Lew Kum Hoi as the Mean Engines
  • Sharon Miller as Queen Elizabeth II


  • This is the final series animated by Jam Filled Toronto.
  • Rosamund Pike, Joe Swash, Dominique Moore, Chris Lew Kum Hoi, Sharon Miller and Matt McCooey join the voice cast.
  • This is the first series of a few things:
    • The first series to have David Stoten as the new head writer.
    • The first series in the US to air exclusively on a streaming platform as opposed to television, likely due to the increased popularity of on-demand streaming platforms in the US in general.
    • Stepney, George, Post Van, Tom Tipper, and Queen Elizabeth II's first appearance in full CGI.
    • Beresford and Ace's first appearance and speaking role in an episode.
    • The first series to have Lucy Montgomery voice Marion, taking over from Olivia Colman.
    • Hiro, Rheneas, Rusty, Rex, Mike and Bert's first appearances since Journey Beyond Sodor.
    • Connor's first appearance since Big World! Big Adventures!.
    • The first series in which Connor, Glynn, Den, Dart, Millie, Carly and Big Mickey do not have speaking roles since their introductions.
    • The first series in which all current members of the Steam Team have a number.
    • The first series since their introduction in which Hong-Mei and An An and Yin-Long do not appear.
    • The first series since she joined the voice cast to not feature Chipo Chung.
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