TONIGHT'S MUST-SEE

"American Idol," 7 p.m., Fox; then "Nashville Star" finale, 10 p.m., USA Network. By now it's clear that this is a great "American Idol" year. The real surprise this year, however, is how good the "Nashville Star" finalists are. Tonight starts with Cowboy Troy and ends with announcing the new champion.

OF NOTE

"NCIS," 7 p.m., CBS. When a drug dealer dies in an elevator with Ziva, she becomes a suspect.

"Hope & Faith," 7:30 and 8 p.m., ABC. In the first episode, Faith learns she can stay in the apartment above the garage. The second flashes back to 1985 when she met her future brother-in-law — a night her sister doesn't know about.

"House," 8 p.m., Fox; concludes Wednesday. While making an arrest, a cop turns giddy. That's the start of a medical mystery so complex that it takes up two nights.

"The Unit," 8 p.m., CBS. A Brazilian drug dealer has turned into an arms dealer when he comes across surface-to-air missiles.

"Dynasty Reunion: Catfights & Caviar," 9 p.m., CBS. Stars and producers on "Dynasty" gather for memories and clips.