Digby is a reliable cable ship who nearly always get stuck somewhere in the harbours. This means Theodore, his best friend, always has to get him out of his jams. His cable is very useful for pulling small boats while other tugs pull ocean liners and barges. He has a Newfoundland accent, and uses catchphrases such as "Oh flibberty jibberty!" and "Oh my starfish and little oysters". He also has a great fondness with cables including his own.
Digby is based on an unknown type of cable ship.
Digby is dark grey with a dark blue and yellow stripe on his stack. His rims are yellow and his lettering is black.