When a pretty Wren faints in a crowded train, Private Bud Flanagan and Captain Ches Allen are quick to render first aid. But over Bud's head, a heavy kitbag wobbles; it falls and scores a direct hit, knocking him unconscious. What follows is a dream sequence involving Ches, the Wren and Bud himself in a series of hilarious adventures as well as a magical medley of the duo's best-loved musical numbers!

Old Mother Riley does the laundry for the dancers in the pantomime "Aladdin", where her daughter Kitty works as a chorus girl. Sneaking a peek at the show one day, Mother Riley accidentally pops up through a trap door onto the stage. Accosted by the angry star, Mother Riley’s belligerent responses have the audience in stitches. Outraged, the star walks out, leaving Kitty to take over the leading role, to great success.

As WWII begins, vaudeville entertainer Tommy Towers is called up to serve. He arranges a job for his girlfriend at the local pub. To keep moral up, his commanding officer orders him to perform for the troops.