"Mud, glorious mud!”

A Happy Day for Percy, originally titled Byron Saves the Day, is a Jack and the Pack episode.


Byron is disappointed when his hard work is being ignored. But when Max and Monty's reckless behaviour causes a water pump to burst and Alfie becomes trapped in thick mud, Byron rushes to the rescue and finally gets the attention he deserves.


  • Percy
  • Jack
  • Alfie
  • Oliver
  • Max and Monty
  • Kelly
  • Byron
  • Miss Jenny
  • Buster (cameo)
  • The Foreman (cameo)


  • The Library Building Site
  • Sodor Construction Company Yard
  • Cronk (mentioned)


  • The original title for this episode was going to be Byron Saves the Day, although that title is still listed on Virgin TV Anytime's website.
  • Alfie's line, "Mud, glorious mud!" comes from the chorus of the popular Flanders and Swann song, The Hippopotamus.
  • This is the only Jack and the Sodor Construction Company episode where Thomas does not appear.


  • The current title is misleading as this episode is mainly focused around Byron.
  • When Byron is cutting out the trench, his treads keep moving after he stops.

In Other Languages

Language Title
Dutch Een gelukkige dag voor Percy
German Ein glücklicher Tag für Percy

Home Media Releases


  • Thomas' Trusty Friends

UK DVD Boxsets

  • The Ultimate Collection
  • 5 Exciting DVDs

AUS DVD Boxsets

  • HiT Favourites 3 Disc Collection


  • On Site with Thomas and Other Adventures

DVD Boxsets

  • Totally Thomas Volume 5
  • On Site with Thomas and Other Adventures/Thomas' Trusty Friends Double Feature
  • On Site with Thomas and Other Adventures/Races, Rescues and Runaways and Other Thomas Adventures Double Feature
  • Ultimate Thomas Collection
  • Play Date Pack
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