Jim and Susan plan to tie the knot- he assures her that his racing days are over - but after another race car driver taunts him into doing one more race- susan has second thoughts!

Randy bigelow - still persistent to stop Jim and Susans wedding hires a private detective to scoop up somthing awful on Jim that will change Susans mind! When it fails he places a stink bomb inside Herbie - in hopes it will ruin the ceremony.

Jim and Susan decide they need a bigger family car.To test drive one they need collateral - Herbie is it, they leave him at the car lot while they take the new one for a spin. Herbie has a temper tantrum and destroys all the cars in the lot.Jim unable to pay for the damages, reluctantly has to leave Herbie inpounded until he can raise the cash. In the meantime thieves try to steal Herbie.