Riley and Mercedes throw stag and hen parties, with the lads outward bound in Wales and the girls jetting off to Ibiza, but Mitzeee gate-crashes the stag do and Warren gets Seth a stripper
Mitzeee lands herself in deep trouble with a rival stag party. Seth frantically turns to Warren for help before spilling a dirty little secret to Riley's best man Doug.
The McQueens get thrown out of a club and end up on a boat with no fuel in the middle of the sea! Alone in the woods, Seth contemplates suicide. Sparks fly between Mitzeee and Riley.
The McQueens, Johnny and Michael find themselves stranded on a deserted island. Warren is shocked to discover Seth may have killed himself, and Silas prepares to teach Theresa a lesson
A white-water rafting accident sends the stags into turmoil. The hens struggle on the deserted island as they look for Jenifique. Silas strikes again. And Duncan attempts to ditch his virginity!