Series 25 of Thomas & Friends: Big World! Big Adventures! will begin airing on Netflix (US) in May 2021, and on Milkshake! (UK) and ABC Kids (Australia) in September 2021.
Terence, Duck, Diesel, Daisy, Flying Scotsman, Oliver, Toad, Bulgy, Skarloey, Sir Handel, Peter Sam, Rusty, George, Stepney, Post Van, Cranky, Butch, Salty, Harvey, Elizabeth, Spencer, Rosie, Rocky, Whiff, Hiro, Charlie, Scruff, Belle, Flynn, Den, Dart, Norman, Sidney, Stafford, Luke, Owen, Merrick, Winston, Connor, Caitlin, Stephen, Millie, Marion, Reg, Glynn, Ryan, Skiff, Mike, Rex, Bert, Fergus Duncan, Hugo, Carly, Theo, Lexi, Merlin, Hurricane, Frankie, Duchess, Sonny, Kenji, Victor, Kevin, Cleo, Beresford, Farmer Finney, and Tom Tipper are likely to appear.
UK and AUS
- John Hasler as Thomas
- Keith Wickham as Gordon and Sir Topham Hatt
- Rob Rackstraw as James
- Nigel Pilkington as Percy
- Teresa Gallagher as Emily, Annie and Clarabel
- Yvonne Grundy as Nia
- Rachael Louise Miller as Rebecca