NCIS (7 p.m., Ch. 2): A Pentagon cryptographer dies under mysterious circumstances.
American Idol (7 p.m., Ch. 13): The remaining finalists perform.
Gilmore Girls (7 p.m., Ch. 30): All sorts of things go awry as Lane and Zach's wedding approaches.
Scrubs (8 p.m., Ch. 5): The janitor sabotages J.D.'s video-diary project.
House (8 p.m., Ch. 13): A donor-recipient relationship raises an ethical quandary.
Veronica Mars (8 p.m., Ch. 24): Veronica tries to help find the person who ran over a classmate's dog.
Almost Perfect (8:30 p.m., Ch. 4): It's been 367 days since ABC aired an original episode of this show, but it's back on the schedule tonight. Claude (Sara Rue) returns from vacation to find herself jobless.
Boston Legal (9 p.m., Ch. 4): Shirley gets involved with her recently remarried ex-husband (Tom Selleck).