Payne and Shultz try to help a client who is accused of blowing up a car dealership that belongs to his father-in-law. Without consulting with Payne, Shultz invites a paralegal to join their firm. To balance out the firm, Payne tries to hire his old secretary back. The four of them work together to try and free their client.
"Head Cases" centers on a successful lawyer who has a nervous breakdown and teams up with a mentally disturbed lawyer with an anger problem. Together, the two represent people with all kinds of issues, not just legal ones.