Season 0

The twenty-first series of Thomas & Friends started airing on 18th September 2017. It is the shortest series to date with 18 episodes and was narrated by Mark Moraghan.
== Episodes ==
# Springtime for Diesel
# A Most Singular Engine
# Dowager Hatt's Busy Day
# Stuck in Gear
# Runaway Engine
# P.A. Problems
# Hasty Hannah
# Cranky at the End of the Line
# New Crane on the Dock
# Unscheduled Stops
# Philip's Number
# The Fastest Red Engine on Sodor
# A Shed for Edward
# The Big Freeze
# Emily in the Middle
# Terence Breaks the Ice
# Daisy's Perfect Christmas
# Confused Coaches
== Songs ==
* Set Friendship in Motion
* Doing it Right (CGI Version)
* Trying (CGI Version)
* Little Engines (CGI Version)
== Characters ==
* Thomas
* Edward
* Henry
* Gordon
* James
* Percy
* Toby
* Donald and Douglas
* Harvey
* Emily
* Spencer
* Rosie
* Belle
* Stephen
* Porter
* Glynn
* Ryan
* Diesel
* Daisy
* Mavis
* 'Arry and Bert
* Salty
* Den
* Dart
* Paxton
* Sidney
* Philip
* Flynn
* Skarloey
* Victor
* Luke
* Millie
* Rex
* Bert
* Annie and Clarabel
* Henrietta
* Troublesome Trucks
* Judy and Jerome
* Terence
* Bertie
* Bulgy
* Kevin
* Harold
* Cranky
* Big Mickey
* Reg
* Sir Topham Hatt
* Lady Hatt
* Stephen Hatt
* Bridget Hatt
* The Thin Clergyman
* The Fat Clergyman
* Dowager Hatt
* Farmer McColl
* The Mayor of Sodor
* Lord Callan
* The Duke and Duchess of Boxford
* The Photographer
* Sir Robert Norramby
* The Grumpy Passenger
* The Bird Watcher
* The Blond-haired Boy
* The Tree Specialists
* Albert's Wife
* Thomas the Baby
* The Female Puppet Show Entertainer
* Farmer Finney (not named)
* Mike (not named; does not speak)
* Skiff (does not speak)
* Rocky (does not speak)
* Duck (cameo)
* Bill and Ben (cameo)
* Stanley (cameo)
* Charlie (cameo)
* Caitlin (cameo)
* Norman (cameo)
* Stafford (cameo)
* Winston (cameo)
* Rheneas (cameo)
* Sir Handel (cameo)
* Peter Sam (cameo)
* Slip Coaches (cameo)
* Trevor (cameo)
* Butch (cameo)
* Jack (cameo)
* Oliver (cameo)
* Max and Monty (cameo)
* Owen (cameo)
* Jem Cole (cameo)
* The Foreman (cameo)
* Mr. Bubbles (cameo)
* Captain Joe (cameo)
* Fergus Duncan (cameo)
* The Teacher (cameo)
* Sodor United Football Team (cameo)
* The Search and Rescue Manager (cameo)
* The Ginger-haired Boy (cameo)
* One of Dowager Hatt's Friends (cameo)
* The Welsh Bird Watcher (cameo)
* The Lady with the Big Hat (cameo)
* The Great Railway Show Judge (cameo)
* The Ffarquhar Stationmaster (cameo)
* The Man with the Green Waistcoat and Grey Hair (cameo)
* Farmer Trotter (mentioned)
* Daisy's Fitter (mentioned)
* Oliver (music video cameo)
* Flying Scotsman (music video cameo)
* Hiro (music video cameo)
* Connor (music video cameo)
* Timothy (music video cameo)
* Gator (music video cameo)
* Samson (music video cameo)
* Ashima (music video cameo)
* Axel (music video cameo)
* Raul (music video cameo)
* Shane (music video cameo)
* Yong Bao (music video cameo)
* Gina (music video cameo)
* Theo (music video cameo)
* Lexi (music video cameo)
* Diesel 10 (music video cameo)
* Ivan (music video cameo)
* The Mainland Diesels (music video cameo)
* Hugo (music video cameo)
* Etienne (music video cameo)
* Marion (music video cameo)
* Duncan (music video cameo)
* Rusty (music video cameo)
* Toad (music video cameo)
* Bradford (music video cameo)
* The Climbers (music video cameo)
* Stepney (mentioned in music video)
=== Characters Introduced ===
* Hannah
* Carly
* The Sea Serpents
== Cast ==
=== UK, AUS and NZ ===
* John Hasler as Thomas
* Keith Wickham as Edward, Henry, Gordon, Harvey, Glynn, Salty, Den, Skarloey, Bert, Bertie, Harold, the Fat Controller, Dowager Hatt, Farmer Finney, Lord Callan, the Great Composer, the Grumpy Passenger and the Woodsmen
* Nigel Pilkington as Percy and a Passenger
* Rob Rackstraw as James, Toby, Donald, Flynn, Big Mickey, the Thin Clergyman and the Red Sea Serpent
* Joe Mills as Douglas
* Teresa Gallagher as Emily, Belle, Mavis, Annie, Clarabel, Judy, Stephen Hatt, Bridget Hatt, the Duchess of Boxford, the Blond-haired Boy, Albert's Wife and the Lady in the Yellow Dress and Hat
* Kerry Shale as Diesel, 'Arry, the Troublesome Trucks and Kevin (Hasty Hannah only)
* Nicola Stapleton as Rosie
* Matt Wilkinson as Spencer, Cranky, Kevin, the Duke of Boxford, the Dock Manager and the Bird Watcher
* William Hope as Iron Bert and Farmer McColl
* Bob Golding as Stephen and Sidney
* Tracy-Ann Oberman as Daisy
* Steven Kynman as Porter, Ryan, Paxton and Dart
* David Bedella as Victor and the Mayor of Sodor
* Michael Legge as Luke
* Mike Grady as Sir Robert Norramby
* Miranda Raison as Millie
* Tim Whitnall as Jerome and Reg
* Maggie Ollerenshaw as Henrietta
* Tom Stourton as Rex, Terence and the Fat Clergyman
* Rasmus Hardiker as Philip and the Troublesome Trucks
* David Menkin as Porter (Cranky at the End of the Line only)
* Lucy Montgomery as Hannah and Carly
* Colin McFarlane as Bulgy and Bertie's driver
* Ian McCue as the Blue Sea Serpent
* Christopher Ragland as the Troublesome Trucks
=== US and CAN ===
* Joseph May as Thomas
* William Hope as Edward, Toby, Iron Bert, Farmer McColl, the Duke of Boxford and the Dock Manager
* Kerry Shale as Henry, Gordon, Diesel, the Troublesome Trucks, Harold and Kevin
* Rob Rackstraw as James, Donald, Flynn, Big Mickey, the Thin Clergyman and the Red Sea Serpent
* Christopher Ragland as Percy and the Troublesome Trucks
* Joe Mills as Douglas
* Jules de Jongh as Emily and the Duchess of Boxford
* Keith Wickham as Harvey, Glynn, Salty, Den, Skarloey, Bert, Bertie, Sir Topham Hatt, Dowager Hatt, Lord Callan, Farmer Finney, the Great Composer, the Grumpy Passenger and the Woodsmen
* Teresa Gallagher as Belle, Mavis, Annie, Clarabel, Judy, Stephen Hatt, Bridget Hatt, the Blond-haired Boy, Albert's Wife and the Lady in the Yellow Dress and Hat
* Glenn Wrage as Spencer and Cranky
* Nicola Stapleton as Rosie
* Bob Golding as Stephen and Sidney
* Tracy-Ann Oberman as Daisy
* Steven Kynman as Ryan, Paxton and Dart
* David Bedella as Victor and the Mayor of Sodor
* Michael Legge as Luke
* Mike Grady as Sir Robert Norramby
* Miranda Raison as Millie
* Tim Whitnall as Jerome and Reg
* Maggie Ollerenshaw as Henrietta
* Tom Stourton as Rex, Terence and the Fat Clergyman
* David Menkin as Porter
* Rasmus Hardiker as Philip and the Troublesome Trucks
* Lucy Montgomery as Hannah and Carly
* Colin McFarlane as Bulgy
* Ian McCue as the Blue Sea Serpent
* Nigel Pilkington as a Passenger
== Trivia ==
* Arc Productions had produced the first seven episodes and Terence Breaks the Ice before their bankruptcy.
* This series contains the 500th episode of the show, P.A. Problems.
* This is the third series not to have Thomas' name titled in any of the episodes, the first being the fifteenth series and the second being the twentieth series.
* This series marks the first of several things:
** The first series to have no episodes written by Andrew Brenner during his tenure as head writer.
** The first series to be produced by Mattel Creations.
** Ian McCue's first series as creative executive and the first series to have him as part of the voice cast.
** Micaela Winter's first series as producer for the series.
** Sukhmani Kaur's first series as assistant production manager.
** Zahara Andrews' first series as production co-ordinator.
** Alan Kennedy's first series as director of post-production.
** Ryan Quaglia's first series as post-production editor.
** Gavin Ebedes' first series as supervising editor.
** Terence, Bulgy and Farmer Finney's first appearances in full CGI.
** Hackenbeck Tunnel, Terence's Field and Suddery Junction's first appearance in full CGI.
** Big Mickey's first appearance with a face in the television series.
** The first series in which Hiro does not appear since his introduction in Hero of the Rails.
** The first series since the fifteenth not to introduce any new engines.
** The first series to feature Rosie without her original lavender livery.
** The first series since the sixteenth to have all of its episodes released in the same year.
** The first series to have episodes fully animated by Jam Filled.
** The first series not to be dubbed in Dutch since the twelfth series.
** The first series where the engines and vehicles perform non-static movements and are able to move their bodies around. This would become more prominent starting with the following series.
* This is the only series for a few things:
** The only series to date where Duck, Caitlin, Stafford, Rheneas, Mike, Oliver the Excavator and Fergus Duncan appear, but do not speak since their introductions or reintroductions respectively.
** The only series to date in which Scruff, Connor, Samson, Hugo, Marion and Bradford does not appear since his introduction in the eighteenth series.
** The only series to date in which Oliver and Toad do not appear since their returns in the eighteenth series.
** The only series to date where Caitlin appears without Connor who doesn't appear since his introduction in King of the Railway.
** The only series to date in which Farmer Finney has a speaking role.
* This series also marks the last of several things:
** Mark Moraghan's last series as narrator for the UK and US dubs.
** The last series to utilise the original storytelling format.
** The last series to use the Engine Roll Call as the title music.
** The last series to use the newly updated new series theme.
** Boris Andreev's last series as art director.
** Alan Kennedy's last series as post-production supervisor.
** Gavin Ebedes' last series as editor.
** The last series to have Helen Farrall as part of the writing team.
** The final series in which the Steam Team consists of all eight of its original members.
** The final series to have Edward, Henry and Toby as main characters and members of the Steam Team.
** The final series to have an episode where Thomas isn't featured at all. From the twenty-second series onwards, he appears and narrates every episode (the latter on a permanent basis).
** The final series where Donald, Douglas, Mavis, Stafford and Rheneas appear to date.
** The last series to use the Engine Roll Call on a regular basis.
** The last series to air on Family Jr. in Canada. Treehouse TV in Canada took over from the twenty-second series onwards.
** The last series not dubbed in Finnish.
** The last series to air its episodes within one year in the UK.
* This is the shortest series of the main series to date, with a total of only eighteen episodes. Originally, a full 26-episode series was planned, but eight were cut to make way for the development of Big World! Big Adventures! and the twenty-second series. In addition to this, Sodor Island Forums confirmed that the reduced total of episodes was needed to make up for the delayed productions of the nineteenth and twentieth series, due to The Adventure Begins being fast-tracked into Arc Productions' schedule. Whilst it has been confirmed that an episode about Rosie before the events of Hasty Hannah and The Fastest Red Engine on Sodor, and Cautious Connor was part of the series before being pushed forward to the twentieth series, the nature of the remaining four episodes is currently unknown.
Category:Seasons