On the eve of Lassiter’s (Timothy Omundson) hastily thrown together wedding to Marlowe (Kristy Swanson), Shawn (James Roday) and Gus (Dulé Hill) procure a party bus and along with Henry (Corbin Bernsen), Woody (Kurt Fuller), and Lassie’s best friend Stumpy (Pete Gardner) kidnap the detective for his bachelor party on the road to the casino resort. Meanwhile Juliet (Maggie Lawson) and Chief Vick (Kirsten Nelson) get roped into Marlowe’s bachelorette party thrown by her friend from prison, Big Wendy (Cocoa Brown).
Marlowe’s party comes to a screeching halt when the male stripper turns out to be Buzz (Sage Brocklebank), whose part time work as a security guard for the casino appears to mostly involve taking off his uniform, and Marlowe’s unexpected cold feet. Meanwhile when Shawn sees the accountant (Steve Rosen) who recent stole money and financial records of local crime boss Max Rizzo (Mike Starr) in the casino the guys’ party ends before it ever really begins. Things get even more complicated when Rizzo kidnaps Marlowe and forces Lassie to exchange the accountant and the evidence which would put him away for the detective’s fiance.
When the accountant escapes before Lassie can make the exchange, and Marlowe makes her own escape from the gangster, the prisoner exchange doesn’t quite go as planned. With a little help from Shawn’s visions, the wedding party is able to find the bride, as well as the missing accountant, in time for the wedding. Despite an absent minister, and a gun fight by the mobsters who crash the festivities, nothing can stop Carlton and Marlowe from exchanging their vows.
One of the zaniest episodes of the series ends dramatically when “Deez Nips” turns on a dime from the festivities at Lassie and Marlowe’s wedding reception to Juliet opening a dangerous door by questioning her boyfriend about his visions and Shawn coming clean with the one thing she wasn’t expecting – the absolute truth. The wedding alone makes the episode memorable, but the final scene between Shawn and Juliet makes it unforgettable as Psych delivers one of the show’s best episodes.