Today on TV

College baseball: Mountain West Conference tournament — BYU vs. Utah (2 p.m., The mtn.); San Diego State vs. UNLV (6 p.m., The mtn.)

NCIS (7 p.m., Ch. 2): Gibbs is forced to make a shocking decision. (Season finale)

American Idol (7 p.m., Ch. 13): The final two — Kris Allen and Adam Lambert — perform. A winner will be declared on Wednesday.

Reaper (7 p.m., Ch. 30): Andi and Sam try to convince Nina to use a portal to go back to hell and get information from Sam's father.

The Mentalist (8 p.m., Ch. 2): Is Patrick being drawn into a trap by Red John? (Season finale)

Dancing with the Stars (8 p.m., Ch. 4): A winner is declared in the season finale.

Glee (8 p.m., Ch. 13): This warped, wild and wonderful high-school musical of sorts is fantastic. This is really must-see TV.

90210 (8 p.m., Ch. 30): Navid and Adrianna spend their prom night at the hospital. (Season finale)

Without a Trace (9 p.m., Ch. 2): A man goes missing after a late-night ocean dive.

Law & Order: Special Victims Unit (9 p.m., Ch. 5): Benson and Stabler try to get a convicted serial killer to reveal the location the body of a judge's son. (Season finale)

Independent Lens (11 p.m., Ch. 7): Survivors of a 1972 Andes plane crash recall how they survived in the mountains for 60 days.

Rescue Me (11 p.m., FX): Tommy and Janet go to parents' weekend at Katie's new school.