Snagglepuss wants to be a musketeer, so he takes a correspondence course and tries to join up with the Three Musketeers.

Charles Laughton plays Kidd, a merchant captain who cons the King of England into allowing him to take to the sea to recover a lost treasure and escort a ship back to London. An old fellow conspirator who he thought dead (John Carradine) and a mysterious young man (Randolph Scott) manage to get on board and cause problems for Kidd.