Jerry's a wharf mouse; he sees a load of cheese being loaded onto a cargo ship and tries a variety of tricks to board, but Tom is on guard.
Tom dives after an unsuspecting Jerry, and when Jerry spots him, Tom chases him into a vent pipe. However, Tom is squeezed through the hole in his board and bounces around through the pipe.
Tom's head is stuck in the board, but he is safe. Jerry then proceeds to twist the board like a helicopter propeller and Tom lifts off. The cat stops the board's rotation and unravels his neck, and then frees himself from the board.
Jerry braces for the deluge, but when Tom opens the hose, nothing comes out because it is not turned on. Tom rattles the hose cluelessly and Jerry turns it on.