In Disney's take on the Alexander Dumas tale, Mickey Mouse, Donald Duck and Goofy want nothing more than to perform brave deeds on behalf of their queen (Minnie Mouse), but they're stymied by the head Musketeer, Pete. Pete secretly wants to get rid of the queen, so he appoints Mickey and his bumbling friends as guardians to Minnie, thi...

A mysterious thief has stolen the prosperous Happy Valley's most prized possession: the musical Singing Harp. Can Mickey, Donald, and Goofy find the answer in the irritable Willie the Giant's magnificent castle up in the blue sky?

Private Duck is a camouflage painter. He paints a giant cannon with some very gaudy colors, until Sergeant Pete explains that the point is to make it so the cannon can't be seen. Donald finds a bucket of experimental invisible paint and makes the cannon disappear. Pete isn't happy with this, and knocks Donald into the paint, then chase...

Donald continually heckles Mickey's magic act, but Mickey bests him at every turn. Donald shoots off a magic pistol that causes all the stage props to fall down on them at the finish of the act.

The gang throws Mickey a surprise birthday party; his present is an electric organ, which Minnie plays while Mickey does a jazzy dance. Goofy bakes the cake, but keeps having trouble with it falling. The gang does a conga line to a Latin tune.