The evil Spaceballs have wasted all the precious air of Planet Spaceball. Dark Helmet's plan is to steal all the air from their next door neighbor, Planet Druidia, so they kidnap Princess Vespa to force her father, King Roland, to give them the combination to their air-shield. Roland calls Lone Starr and his half-man, half-dog sidekick Barf who need money to pay off their debt to Pizza the Hutt, to save the princess.