When the nefarious Dark Helmet hatches a plan to snatch Princess Vespa and steal her planet's air, space-bum-for-hire Lone Starr and his clueless sidekick fly to the rescue. Along the way, they meet Yogurt, who puts Lone Starr wise to the power of "The Schwartz." Can he master it in time to save the day?

A conniving Broadway producer and his meek accountant plan to profit from charming wealthy old biddies to invest in an overbudget production, and then put on a sure-fire disaster, so nobody will ask for their money back — and what's more disastrous than a tasteless musical celebrating Adolf Hitler.