I Walk the Line (7 p.m., Ch. 2): Sheryl Crow, the Foo Fighters, Norah Jones, Alison Krauss, Kris Kristofferson, Jerry Lee Lewis, Martina McBride, Brad Paisley, Kid Rock and U2 are among those who perform in this tribute to Johnny Cash.
That '70s Show (7 p.m., Ch. 13): Kelso (Ashton Kutcher) proposes to Jackie. But Vic (guest star Bruce Willis) makes Kelso a job offer he cannot refuse. Kutcher, of course, just married Willis' ex-wife, Demi Moore.
Lost (8 p.m., Ch. 4): In this expanded episode — which runs 65 minutes — we find out what happened to the "tailies" — the survivors from the tail section of the jetliner.
Veronica Mars (8 p.m., Ch. 24): Veronica poses as a baby sitter to find an abused child.
CSI: NY (9 p.m., Ch. 2): Poker leads to murder.
Law & Order (9 p.m., Ch. 5): A guy who smuggles illegal aliens is murdered.
Invasion (9:05 p.m., Ch. 4): In this shortened episode — 55 minutes — Mariel makes a shocking discovery in the water.