It started out as a favor for a friend... Late one night, Jack Keaton had jokingly agreed to marry his old buddy Stephanie Brewster. He didn't think much about it... until he got an invitation to a large, lavish wedding in Hawaii. His own. And it was turning into a nightmare... Jack was trying to roll with the punches, so when his hotel doorbell rang two days before the big day, he expected some champagne, maybe a boutonniere. Certainly not Dani Carpenter, a beautiful brunette -- not his bride -- wearing a Big Bird outfit and carrying a bundle of trouble! A baby, with a note that said the little guy was all his. Jack was now a groom and a daddy -- and he still wasn't sure how it had all happened.