Through mud, garbage, and muck, Thomas and his engine friends show that being really Useful can be a dirty job! See James turn into the Really Muddy Engine, and Thomas get showered with rubbish. Watch Peter Sam make a big mess trying to keep things on track, as Thomas creates chaos with the crows and much, much more. Join Thomas and the Steam Team as they make the best of the mess in these exciting muddy and mucky adventures! Episodes include: Muddy Matters, Thomas and the Garbage Train, Don't Bother Victor!, Whiff's Wish and Thomas Toots the Crows.
| Actor | Role |
|---|---|
 Michael BrandonNarrator / Diesel (voice) | Narrator / Diesel (voice) |
 Martin ShermanThomas / Percy (voice) | Thomas / Percy (voice) |
 Kerry ShaleJames / Sir Topham Hatt / Photographer / Gordon / Mr. Percival (voice) | James / Sir Topham Hatt / Photographer / Gordon / Mr. Percival (voice) |
 Jules de JonghEmily / Duchess of Boxford / Mavis (voice) | Emily / Duchess of Boxford / Mavis (voice) |
 William HopeFarmer McColl / Whiff / Rocky / Edward (voice) | Farmer McColl / Whiff / Rocky / Edward (voice) |
 Keith WickhamSkarloey / Sir Handel / Den (voice) | Skarloey / Sir Handel / Den (voice) |
 Ben SmallRheneas / Troublesome Trucks (voice) | Rheneas / Troublesome Trucks (voice) |
 Steven KynmanPeter Sam (voice) | Peter Sam (voice) |
 David BedellaVictor / Mayor of Sodor (voice) | Victor / Mayor of Sodor (voice) |
 Glenn WrageSpencer (voice) | Spencer (voice) |
 Ben ForsterMr. Perkins | Mr. Perkins |