While in his teens, Donny fathered a son, Todd, and raised him as a single parent until Todd's 18th birthday. Now Donny resurfaces just before Todd's wedding after years apart, sending the groom-to-be's world crashing down.

While still in his teens, Donny (Adam Sandler) fathered a son, Todd (Andy Samberg), and raised him as a single parent until Todd's 18th birthday. Now, after not seeing each other for years, Todd's world comes crashing down on the eve of his wedding when an uninvited Donny suddenly shows up.

Trying desperately to reconnect with his son, Donny is now forced to deal with the repercussions of his bad parenting skills. Co-starring Leighton Meester and featuring incredible cameos from a cavalcade of stars including Susan Sarandon, Vanilla Ice and James Caan.