Dennis is considered to be a very lazy Diesel who tries to take advantage of others and depend on them to do his work Especially his brother, Norman. Dennis will often create excuses to get out of work, but usually gets caught in his lies, and always says sorry, but whether or not he means it is the question.
Dennis is based on No. 11001, a Bulleid diesel built at Ashford Works, England.
- Toby the Brakevan (deleted scene; cameo)