- Benjamin "Ben" Kirby Tennyson as Thomas
- Gwendolyn "Gwen" Tennyson as Emily
- Kevin Ethan Levin as Sir Topham Hatt
- Julie Yamamoto as Lady Hatt
- Maxwell Tennyson as Percy
- Aggregor as Diesel
- Sir George as James
- Diagon as BoCo
- Vilgax as Arry
- Charmcaster as Bert
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