When Guybrush return to LeChuck 's ship with the elixir , he learn that LeChuck have returned to Mêlée IslandTM to marry Elaine at the church . He promptly return to Mêlée IslandTM and gatecrashes the wedding , only to ruin Elaine 's own plan for escape ; in the process he lose the elixir . Now confronted with a furious LeChuck , Guybrush is savagely beaten by the ghost pirate in a fight ranging across the island . The fight eventually arrive at the island 's ship emporium , where Guybrush find a bottle of root beer . Substituting the beverage for the lost elixir , he spray LeChuck , destroying the ghost pirate . With LeChuck defeated , Guybrush and Elaine enjoy a romantic moment , watching fireworks caused by LeChuck exploding .