Thomas the Tank Engine & Friends

Den and Dart (19x11)

Air date: Mar 17, 2016

Best friends Den and Dart work together at the Dieselworks and are rarely separated, but when Mavis has an accident, the Fat Controller sends Den to work at the quarry until she is repaired. Den worries about taking on a new job on his own, especially when Mavis warns him how troublesome the trucks can be.