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“Now what did i come in here for again?"
"Oh yeah.”
―Sidney and Dart

The Case of the Puzzling Parts is the twenty-third episode of the twenty-second series.


Sidney has a flatbed with some parts that are needed, but he forgets why the parts are needed. Paxton decides that he and Sidney should be special agents to find out what they are for, they found out from Thomas that the parts are for a diesel engine. While they are searching for more clues to find, Sidney starts to have a few problems with himself and after Paxton points out that he has a wonky horn, a broken lamp, a faulty buffer and coughing up black smoke, both diesels realise that the parts are for Sidney himself.



Voice Cast

UK and AUS

US and CAN

  • Joseph May as Thomas
  • William Hope as Whiff
  • Keith Wickham as Skarloey
  • Steven Kynman as Paxton and Dart
  • Bob Golding as Sidney
  • Tim Whitnall as Reg


  • This episode marks Whiff, Scruff, Dart and Luke's only appearances in the twenty-second series as well as Sidney and Skarloey's only speaking roles in the twenty-second series.
  • Paxton breaks the fourth wall once again in this episode, as does Sidney.


  • When Thomas backs away from Sidney, he makes no puffing sounds and Paxton's engine does make a sound when he reverses alongside Sidney.
  • Throughout the episode, Sidney's wheels move slower than the speed he is travelling at.
  • Nick Jr's captions misspell Sidney as Sydney throughout the episode.

In Other Languages

Language Title
Brazilian Portuguese O Caso das Peças Intrigantes
Dutch De Zaak van de Onbekende Onderdelen
Finnish Varoosien arvoitus
German Auf Spurensuche
Hebrew תעלומת החלפים המסתוריים
Hungarian A fura részek ügye
Polish Sprawa Tajemniczych Części
Russian Загадочное дело
Spanish El Caso de las Piezas Misteriosas

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