A battleship mostly run by dogs sets sail. The crew threatens to get the mess hall before the captain will, the captain tells them to stop. The people in the ship are informed of a radio message about a reward for capturing a pirate submarine. The crew sets off in planes, leaving Porky behind. When the ship is attacked by the submarine, it's up to Porky to defend the ship.

The mice are on the loose after hours in a doctor's office, playing with the various pieces of medical apparatus. Susie Mouse is caged for research until her lover Johnnie frees her. A mouse orchestra plays a swinging wedding song. But throughout, a cat is stalking...