When David Locking (Samuel) proposes to his girlfriend Mia Ramme (Brent) a week after they meet in Tuvalu, he rounds up his three best friends (Marshall, Bishop, and Draxl) to attend his wedding in Australia as best men. Havoc ensues as the trio accidentally steal drugs, are chased by a mobster (Le Marquand), and get the father-in-law's (Biggins) sheep stoned.