Stephen Hatt is the son of Sir Topham Hatt, the son of Lady Hatt and the sibling of Bridget Hatt.
- Season 1 - Toy Trains and Doctors and Nurses
- Season 2 - The Flower Dome, The Daisy Chain, Retirement Time and The Brown Bear
- Season 4 - Daisy and the Fish and Harvest Time
- Season 5 - Dressing Up, The Christmas Sacks, Lights and A Hole's One
- Season 7 - Trusty Thomas and The Easter Cake!
- Season 8 - A Friend's Party, The Umbrella, Misbehaving and Puzzles
- Season 9 - Station Mystery