Survivor: Guatemala (7 p.m., Ch. 2): One tribemate's incessant paranoia drives another to the breaking point. And an 11th person is voted out.

Alias (7 p.m., Ch. 4): Sydney and APO try to find out who Gordon works for.

Joey (7 p.m., Ch. 5): To impress a girl, Joey volunteers to direct a musical. Big mistake.

The O.C. (7 p.m., Ch. 13): Taylor comes between Seth and Summer.

Everybody Hates Chris (7 p.m., Ch. 24): Chris' frugal father is thrilled when he finds $200 in food stamps. Chris' mother isn't so thrilled.

Smallville (7 p.m., Ch. 30): Professor Fine convinces Clark to destroy the Fortress of Solitude.

Will & Grace (7:30 p.m., Ch. 5): Jack announces he's moving.

CSI (8 p.m., Ch. 2): In the conclusion of a two-parter, Grissom tries to determine if a cop was killed by a fellow officer — intentionally.

Reunion (8 p.m., Ch. 13): In 1991, Amy is kidnapped and Sam is forced to tell Craig the truth.

Everwood (8 p.m., Ch. 30): Hannah prepares to leave Everwood behind.

Without a Trace (9 p.m., Ch. 2): As is the case in every episode, the team investigates a disappearance. What makes this episode different is that it's told from the point of view of a missing boy.

ER (9 p.m., Ch. 5): It's no longer fashionable to say so, but this is still a good show. It's not what it once was, but the current cast is very appealing, and as a medical soap, it's very watchable. But stunts like the one tonight — a plane crash — sort of make "ER" look desperate. Here's hoping it isn't as bad as the tank-on-the-loose-in-the-city stunt in a 2004 episode.