Thomas as Wil Cwac Cwac (Thomas and Wil are both main characters)

Gordon as Hwmffra

Daisy as Martha Plu Chwithig

Bertie as Cousin Percy

Emily as Mary Pickles

Edward as Huw Herc

James as Sioni Ceiliog Glas

Percy as Dic Penmoel

Henry as Ifan Twrci Tenau

Spencer as Mr Owie Policeman

Bulgy as Mr Puw the Shop Shop

Toby as Doctor Parry

The Fat Controller as Mr Jones the School

Mavis as Sioni's mother

TFC's cat as black cat

Diesel 10 as the nasty dog

Champion as the bull