- “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.
- 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 episode marks Byron's last speaking role to date.
- This is the only episode of the spin-off Jack and the Pack 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.
Home Media Releases
UK DVD Boxsets
AUS 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
|Jack and the Sodor Construction Company|
|#01||A Visit from Thomas||#10||The Tortoise and the Hare||Canceled:||Bossy Byron|
|#02||Jack Owns Up||#11||Thomas' Trusty Friends (episode)||Canceled:||The Importance of Being Patrick|
|#03||On Site with Thomas||#12||Alfie Has Kittens||Canceled:||Pop Goes the Diesel (Jack and the Pack)|
|#04||Percy's Scary Tale||#13||Mud Glorious Mud||Canceled:||Jack and the Quack|
|#05||Kelly's Windy Day||Canceled:||No Dozer is an Island||Canceled:||Alfie Has a Secret|
|#06||A Happy Day for Percy||Canceled:||Friendship Story||Canceled:||Isobella Gets Steamed|
|#07||A Tale for Thomas||Canceled:||Safety First||Canceled:||Jack and Alfie Swap|
|#08||Thomas and the Moles||Canceled:||Treasure Hunt||Canceled:||Kelly's Heroes|
|#09||Percy Helps Out||Canceled:||Snow Rescue|