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“Don't call me "Dirty Percy!"”
―Percy to Gordon

Thomas, Percy and the Squeak is the twenty-first episode of the sixth series.


Famous opera singer Allicia Botti is coming to Sodor for a concert and the engines are wondering who will take her to the venue at the castle, a job that Gordon states Percy will not be chosen for as he is very dirty. Come the following day, the Fat Controller chooses Thomas and tells him to be squeaky clean.

Thomas goes to the washdown where Percy is waiting to be cleaned. However, Thomas insists that he must go next as he has an important job. Percy sets off, still dirty, to collect some coaches for his guaranteed connection. Once Thomas and his coaches are cleaned and prepare to set off, however, they hear a squeak. His crew assume that Annie and Clarabel's wheels are the cause of this, so they oil them. But, once on the move again, the squeak continues, making Thomas concerned.

"I can't possibly travel in coaches riddled with mice!"

At Brendam, Thomas pulls up to collect Allicia and the Fat Controller opens one of Clarabel's doors. However, there is a mouse inside, which causes Allicia to scream in horror; she screams so loudly that windows shatter all around Brendam, which amuses Gordon who claims she is definitely a Coloratura. Allicia is cross and refuses to ride onboard Clarabel, much to the embarrassment of Thomas and the Fat Controller. Because of this, Thomas does not feel important at all. Just then, Percy arrives back from his guaranteed connection and Allicia Botti considers him as a proper engine because of his dirty appearance and decides to ride in one of his coaches instead, much to Gordon's disgust.

Later, Thomas is back at the washdown when Percy arrives. This time, he lets Percy go next for his wash. That night, whilst Allicia Botti is performing her concert at the castle, Thomas and Percy are at Tidmouth Sheds where the mouse - whom Thomas has named "Allicia" - now lives.




  • Extended stock footage from Percy's Chocolate Crunch is used, as is cropped stock footage from Scaredy Engines. This is noticeable as, on the left of the scene, what appears to be jack-o-lanterns can be seen next to where the fireworks would have been in that episode.
  • Allicia Botti's screams originally come from the Series 4000 Hollywood Sound Effects Library by Sound Ideas.
  • The sound effect for the mouse is often used as a squeaky door. It was particularly used in The Simpsons episode, Please Homer, Don't Hammer 'Em.
  • A script dub of this episode was done in the Japanese show Ponkids 21, with Leo Morimoto reprising his role as the narrator, with members of REAL BLOOD doing the character voices. Leo later voiced James in another take.
  • At the end of this episode, the mouse squeaks once in the UK duv, but in the US dub, it squeaked twice. The mouse also has a different squeaking sound in the Bumper Party Collection! UK DVD.
  • In the last close-up of Allicia Botti screaming, there is an animation effect for her uvula seen in her mouth.
  • Due to scenes on one particular set across the series being filmed in one go, the scene at Knapford in this episode looks pretty similar to the first scene at Knapford in the sixth series episode, Edward the Very Useful Engine. The same people are boarding the same trains, the same engines are in the same positions and the same posters are up.
  • In the UK dub, when Allicia Botti's scream shatters the windows across Brendam, vocal effects are added to give off the effect that the scream can be heard far away. The US and international dubs remove these effects for unknown reasons.
  • This marks Allicia Botti's only speaking role until the eleventh series episode, Toby's Triumph.
  • The glass shattering noise was reused in Thomas and the Lighthouse, albeit high pitched.
  • The line "Don't call me Dirty Percy!" has become a common internet meme.


  • At the beginning a poster of Allicia Botti is visible; it says she is performing at the castle tonight, but she was performing the next night.
  • When Thomas arrives at the docks, his steam platform is visible.
  • Gordon's front and rear bogie are severely derailed in the last scene of Thomas and Percy at the washdown.
  • When Percy arrives at Brendam, his steam platform is visible and some of the steam from his funnel disappears, indicating a film cut.
  • The small scale model of Allicia the mouse is missing her forepaws when she is inside Clarabel. However, they are present on her large scale model.
  • In the Polish dub, Gordon's English name is used once by accident.
  • In the Japanese dub, before Allicia Botti screams she has Percy's voice.
  • In ABC for Kids - Just for Fun, the episode's name is misspelled as "Thomas, Percy & Squeak."


  • Gordon: Well one things for sure, he won't choose dirty Percy.
  • Percy: Don't call me dirty Percy!


  • Allicia Botti: A MOUSE!!! (US dub) 
(she screams very loudly, causing some windows to break)
  • Gordon: Definitely a coloratura.
  • Allicia Botti: I can't possibly travel in coaches riddled with mice!


  • Allicia Botti: Look at the little green engine! So-a sweet and-a dirty like a proper steam engine!
  • GordonUK dub: Peasant! / US dub: But he's filthy!
  • PercyUK dub: Yes, I am pleasant! / US dub: But I clean up nice!


In Other Languages

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Language Title
Chinese Mandarin 托马斯,珀西和尖叫
Czech Tomáš, Percy a podivné pištění
Danish Den mystiske lyd
Dutch Thomas, Percy en het gepiep
Hungarian Thomas, Percy és a cincogás
Italian Il Topolino
Japanese トーマスとパーシーとキーキーごえ
Korean 성악가와 생쥐
Norwegian Thomas, Percy og pipingen
Polish Tomek, Piotrek i Pisk
Portuguese Thomas, Percy e o guincho
Romanian Thomas, Percy și Chițâitul
Russian Томас Перси и странный писк
Slovenian Tomaž, Poldi in Cviljenje
Swedish Thomas, Percy och gnisslet
Taiwanese Mandarin 托馬斯,珀西和吱吱聲
Welsh Persi a'r Wich

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