Chevy Chase and Beverly D'Angelo return as Clark and Ellen, winners of a deluxe European tour on which teenage offspring Rusty and Audrey will join them. The deluxe accommodations aren't. Clark tries left-sided English driving ... and leaves Stonehenge unhinged. In Bavaria a slap-dancing polka turns into a slaphappy free-for-all. Clark's home videos of a playful towel-clad Ellen fall into the sleazy hands of a porno filmmaker. In other words, it's typical holiday road havoc for the Griswalds.