An aging slacker and former sperm donor discovers that he is the biological father of 533 children, and that 142 of them have filed a lawsuit to learn his true identity in this Dreamworks comedy starring Vince Vaughn. Aside from the fact that he was a regular visitor at a fertility clinic 20 years ago, there's nothing particularly remarkable about David Wozniak (Vince Vaughn): He drives a meat-delivery truck for his father's butcher business, he can't seem to hold down a relationship, and lately he's taken to growing marijuana as a means of paying off an $80,000 debt. He's so inept at even the simplest things that his girlfriend Emma (Cobie Smulders) can't stand the sight of him after she reveals that she's pregnant with his child. When an attorney tracks David down and reveals that he is the biological father of 533 children, and that 142 of them have filed a lawsuit to learn his true identity, the former donor panics, recruiting his lawyer friend Brett (Chris Pratt) to defend the privacy agreements he signed at the clinic. When Brett returns with an envelope containing profiles of all 142 children named in the lawsuit, however, David can't help but look, and before long he's surreptitiously injecting himself into the lives of his unsuspecting offspring. Meanwhile, as he begins to grow excited at the prospect of having his own child, he finds that sometimes the best fathers are the men who seem the least fit for parenting.