What do you do if you are Jerry Seinfeld? Anything you want to do. The sitcom star appears in a spoof of his own image on the second-season finale of “Head Case” (9 p.m., Starz).

Alexandra Wentworth stars in “Head Case” as the celebrity therapist Dr. Goode. Her practice allows scores of boldfaced names to cameo on the show and send up the popular notion of self-absorbed Hollywood stars. The central joke of “Head Case” is that the buttoned-down and WASPy Goode is the biggest narcissist of them all, turning every therapy session into an extension of her frazzled and ill-defined personal life.

This week, she’s in New York to rescue her colleague Dr. Finkelstein from a peculiar hostage situation and takes time out to counsel Seinfeld (in a dentist’s chair, of all places) about his worries. Seinfeld’s central concern is his wife’s therapy (with Goode). Why, he wonders, would anyone married to him, of all people, need therapy?

Back in Los Angeles, actor Craig Bierko finds his session with Goode interrupted by her insistence that Melina Kanakaredes (as herself) sit in. She’s preparing the “CSI: NY” star for an acting role in a biography of Sigmund Freud. Things go surprisingly well until Goode begins to resent the fact that the actor-shrink seems to be making more progress than she could have imagined.

“Head Case” pushes the Hollywood-insider obsession of HBO shows like “Entourage” and “Curb Your Enthusiasm” to a whole new level of silliness. Much like “Curb,” it’s more about snickers than belly laughs and, like seltzer (or in Dr. Goode’s case, club soda), a little more effervescent than substantial.

• Kristen Bell (“Heroes”) guest stars on the season finale of “Party Down” (9:30 p.m., Starz) as a member of a rival catering team.

• Maybe it’s time History changed its name to “The Guys of a Certain Demographic Channel.” Their series (“Ice Road Truckers,” “Ax Men,” “Life After People”) have only tenuous connections to the study of the past. And don’t get me started on “UFO Hunters.”

Why does it not surprise me that History is broadcasting the 1992 Western “Unforgiven” (7 p.m., History), starring Clint Eastwood, Morgan Freeman and Gene Hackman? It may be a very good movie. But it’s not History.

Other cable networks have changed their names to reflect new audiences. Who associates A&E with arts and entertainment? There’s not much learning left on the old Learning Channel, TLC. And The Nashville Network is now Spike. Just what Spike is remains a matter of conjecture.

Maybe they should drop the History and call it “The Dockers Channel: Guy Stuff for the Relaxed-Fit Generation!” I joke, people, because I’m there.

• “20/20” (9 p.m., ABC) follows four families with children afflicted by Tourette’s syndrome. Most popularly associated with vocal outbursts of a strange and at times vulgar nature, Tourette’s strikes an estimated one in 1,000 children, and to date, has no known cure.

Tonight’s other highlights

• An evil spirit makes “friends” online on “Ghost Whisperer” (7 p.m., CBS).

• An accused man takes rash action on “Flashpoint” (8 p.m., CBS).

• Wilson returns consumed by grief on “House” (8 p.m., Fox).