 
The S.S. Stubborn is the name of the ship that the Mr. Men and Little Misses cruise on.
Apperences
Lakes
The S.S. Stubborn was only a canoe back then, but we can still call it the S.S. Stubborn because Mr. Stubborn is the captin!! He and Mr. Happy are taking a dangorus ride, and Mr. Happy survives, while Mr. Stubborn drowns.
Boats
In Boats, the S.S. Stubborn becomes a ship. Ms. Calimity is trying to warn the captin, (Mr. Stubborn, of course) that they should stay clear of iceburgs. In the end, they hit one, and sink, and Mr. Stubborn says that they AREN'T sinking. Ms. Calimity gets saved by Mr. Scatterbrain. (Fine, we'll say Mr. Lazy rescued her to!!)
Ships
The S.S. Stubborn's first mate is seen for the very first time (Little Miss Chatterbox) and she tells Mr. Stubborn that the're sinking, but being Mr. Stubborn, Mr. Stubborn "goes under with is ship :(
Out To Sea
The name S.S. Stubborn is reavled, and Little Miss Daredevil is taking Mr. Stubborn (captin), Little Miss Chatterbox (first mate), Mr. Happy (reporter), and Mr. Lazy (camera man) to see the THREE times sunk, S.S. Stubborn. Of course, Mr. Stubborn says his boat never sank, and he sank the sub.