Dennis is a lazy Diesel. He has a twin named Norman.


When Dennis was new to the railway, he tried to take advantage of Thomas. He soon learnt his lesson when he reversed into a ditch. With Thomas' help he was able to finish his work and promised to be a Really Useful Engine from now on.

Dennis and a number of other Diesels later waited at Anopha Quarry to hear if Thomas had been found in the days leading up to the reopening of Great Waterton.

Community content is available under CC-BY-SA unless otherwise noted.