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The twenty-first series of Thomas & Friends aired in the UK on 18th September 2017 and on 15th December 2017 in the US.

Episodes

Screenshot UK title (top)
US title (bottom)
Written by Original UK release date Episode number #
SpringtimeforDieselSpringtime for DieselDavey Moore18th September 2017#01
Daisy's springs need fixing after Diesel bumps her, and when the rumors spread about Daisy not being able to be mended, Diesel begins to worry.
AMostSingularEngineA Most Singular EngineDavey Moore19th September 2017#02
Diesel causes trouble between Daisy and Harvey by spreading rumors.
DowagerHatt'sBusyDayDowager Hatt's Busy DayLee Pressman20th September 2017#03
Dowager Hatt runs the railway while Sir Topham is away, but causes confusion and delay.
StuckinGearStuck in GearDavey Moore21st September 2017#04
A branch gets stuck in the gears of Harvey's crane, but he doesn't want to make a fuss about it.
RunawayEngineRunaway EngineHelen Farrall22nd September 2017#05
After mocking the way she was speaking up for herself, Stephen thinks that Millie ran away after hurting her feelings.
PAProblemsP.A. ProblemsLee Pressman25th September 2017#06
The Fat Controller/Sir Topham Hatt's new public address system causes havoc at Knapford station.
HastyHannahHasty HannahLee Pressman26th September 2017#07
A new coach temporarily replaces Henrietta while she is at the works.
CrankyattheEndoftheLineCranky at the End of the LineLee Pressman27th September 2017#08
Cranky thinks he will be replaced by a big, new, fancy crane.
NewCraneontheDockNew Crane on the DockLee Pressman28th September 2017#09
Cranky competes against Carly the new crane when she starts taking all his work.
UnscheduledStopsUnscheduled StopsHelen Farrall29th September 2017#10
Thomas starts making unscheduled stops for his passengers, which in turn delays others.
Philip'sNumberPhilip's NumberLee Pressman2nd October 2017#11
Philip tries to discover why he has the number 68 painted on his side after being teased about it.
TheFastestRedEngineonSodorThe Fastest Red Engine on SodorHelen Farrall3rd October 2017#12
After Rosie is repainted red, she and James have a race.
AShedforEdwardA Shed for EdwardLee Pressman4th October 2017#13
Edward searches for a new shed while his berth at Tidmouth is being repaired.
TheBigFreezeThe Big FreezeHelen Farrall1st December 2017#14
When a big freeze hits Sodor, Diesel finally proves himself to be a hero.
EmilyintheMiddleEmily in the MiddleDavey Moore6th December 2017#15
Emily gets stuck in the middle while helping Donald and Douglas.
TerenceBreakstheIceTerence Breaks the IceLee Pressman11th December 2017#16
Terence takes a shortcut across a frozen lake while collecting Christmas trees.
Daisy'sPerfectChristmasDaisy's Perfect ChristmasDavey Moore18th December 2017#17
Daisy is disappointed when her Christmas does not go exactly as planned.
ConfusedCoachespromoConfused CoachesHelen Farrall22nd December 2017#18
Spencer and Gordon upset their passengers when their competitive behaviour gets out of hand.

Songs

Characters

Characters Introduced

Cast

UK, AUS and NZ

US and CAN

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 many things:
    • 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 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 where 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 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.
  • This is the only series for a few things:
    • The only series to date in where Duck, Caitlin, Stafford, Rheneas and Mike appear, but do not speak since their introductions.
    • The only series to date since their returns in the eighteenth series in which Oliver and Toad do not appear.
    • The only series to date since he returned in Misty Island Rescue in which Whiff does not appear.
    • The only series to date in where Scruff, Connor, Samson, Marion and Bradford do not appear since their introductions.
    • The only series to date where Caitlin appears, but without Connor who does not appear since his introduction in King of the Railway.
    • The only series to have no episodes written by Andrew Brenner despite being the head writer.
    • The only series since she joined the voice cast in Tale of the Brave not to have Olivia Colman as part of the voice cast.
    • The only series to date in which Big Mickey and Farmer Finney have speaking roles.
  • 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 Thomas storytelling format.
    • 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 does not appear at all. From the twenty-second series onwards, he appears and narrates every episode.
    • The last series to use the Engine Roll Call on a regular basis.
    • The last series to be aired on Cartoonito UK.
  • This is the shortest series of the main series to date, with there only being 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. It was also confirmed on Sodor Island Forums that it was needed to make up for the delayed productions of the nineteeth and twentieth series, due to The Adventure Begins being fast-tracked into Arc Productions' schedule.

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