Beware of a show with a pun in the title. The new comedy-drama “Head Cases” (8 p.m., Fox) concerns two lawyers suffering from mental disorders who form a law practice and defend clients too zany to appeal to the madcap litigators from “Boston Legal” and “Ally McBeal.”

Chris O’Donnell stars as Jason Payne, a corporate lawyer consumed with success, much to the detriment of his wife, Laurie (Krista Allen), and troubled son, Ryan (Jake Cherry). When he forgets an appointment with the boy’s therapist, Laurie kicks Jason out of the house. He snaps, suffers a nervous breakdown and is sent to a home, where he meets Shultz (Adam Goldberg), a low-rent lawyer with iffy clients and a regrettable mental affliction that results in brief, explosive binges of rage and other inappropriate behavior. In no time at all, Jason loses his corporate job and finds himself collaborating with the wacky Shultz. It’s the beginning of a beautiful friendship that only a sitcom writer could love.

It’s a shame “Cases” suffers from such a flimsy premise and frequently over-the-top situations. O’Donnell and Goldberg make a good pair, not dissimilar to Donald Sutherland and Elliott Gould in Robert Altman’s “MAS*H” – an amusing contrast of dark and light, button-down and brash, retentive and impulsive. But Goldberg is truly wasted here. His twitchy character has potential, but his outbursts are more disturbing than amusing. You don’t have to be thin-skinned or politically correct to find the show’s “crazy” stereotypes both grating and demeaning.

Tonight’s other highlights

¢ Down to eight on “So You Think You Can Dance” (7 p.m., Fox).

¢ “Dancing with the Stars” standout John O’Hurley plays host to the 29th annual “Mrs. America Pageant” (7 p.m., WE).

¢ The raft escapees catch something strange on their radar on the season finale of “Lost” (8 p.m., ABC). Down the hatch!

¢ Results read on “Rock Star: INXS” (8 p.m., CBS)

¢ Inventors vie for a chance to sell their contraptions on a home-shopping channel on the reality competition “Made in the USA” (9 p.m., USA).

¢ Cris Carter, Cris Collinsworth, Bob Costas and Dan Marino return for the 29th season of “Inside the NFL” (9 p.m., HBO).