By Robert Bianco, USA TODAY
?Most fans probably watched tonight's repeat of NCIS (CBS, 8 ET/PT) the first time around, considering the show's popularity and the episode's placement near the conclusion of May's Port-to-Port killer plot.
But for those who don't watch and have wondered why this long-running procedural is so popular, tonight may offer a chance to find out.
Some of the plot points may be confusing, but shows like NCIS are designed to welcome new viewers even if you enter midkill.
?Anyone trying NCIS might as well check out its companion piece, NCIS: Los Angeles (CBS, 9 ET/PT).
Tonight, they try to find out who uploaded classified and dangerous Pentagon documents onto a blog site.
?Looking for something more serious? PBS' Frontline (9 ET/PT, times may vary) examines the reliability of medical expertise in child-death cases and takes a look at for-profit colleges that aggressively recruit veterans.
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