NCIS (7 p.m., Ch. 2): Team members are in danger as they hunt a killer. (Two-hour season finale)

American Idol (7 p.m., Ch. 2): David Archuleta and David Cook face off in the finals; a winner will be declared Wednesday.

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

Reaper (8 p.m., Ch. 30): A demon revolution targets Sam, leading to a shocking revelation. (Season finale)

Shark (8 p.m., Ch. 2): An escaped convict seeks revenge against Sebastian. (Series finale — the show has been canceled)