Thomas will introduce us to his best friend, Percy.
I've actually never seen any Season 12 airings except for Best Friends & maybe Thomas & the Billboard, so I've never seen or don't remember these segments.
PBS Airing: Mistakes
I don't own this, I ripped this from Brandon Hargus' PBS airing video
Appears on these pages
Thomas' Favourite Friends is a twelfth season segment that features Thomas' Friends of the...