Primetime Preview: Rat Pack Night on American Idol

While many of its viewers have likely never heard of the Rat Pack, American Idol will feature songs by these singers from the 60s tonight. Here's what else will air in primetime...

• 8:00 p.m. The top five perform on American Idol (Fox)? LL Cool J and Chris O'Donnell appear on NCIS (CBS); Sam gets a tutor on Reaper (The CW).
• 9:00 p.m. There's a serial killer on Fringe (ABC); we meet Naomi's sinister sister on 90210 (The CW); a mobster is murdered on The Mentalist (CBS).
• 10:00 p.m. Claire is robbed on Cupid (ABC).

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.