* V (10:02/9:02c ABC)
Whenever a drama takes a brief siesta, the show's shepherds typically use the last episode to drop cliff-hanger bombshells to hook viewers for the series' return, like putting Erica's son in harm's way, Chad's grave prognosis and that creepy cross-species pregnancy. The re-imagined sci-fi series awakens from its winter slumber to address those suspenseful scenarios, with genre babes Rekha Sharma (Battlestar Galactica) and Lexa Doig (Gene Roddenberry's Andromeda) along for the ride.
* Dancing with the Stars (8/7c ABC)
After two rounds of dancing, one couple will have the dubious distinction of being the first to go in Season 10 - but they won't be leaving before they're entertained during tonight's results show. Via video message, Wyclef Jean introduces Haitian dancer Emmanuel Pierre-Antoine, who will lead dancers from his homeland in a tribute performance for their country. In addition, the Beach Boys (along with John Stamos) perform a medley; and Adam Corolla gives a comic critique of the celebs' performances.
It's the night fans of the original series have been waiting for, as Jo Reynolds (Daphne Zuniga), Jane Mancini (Josie Bissett), Amanda Woodward (Heather Locklear) and Michael Mancini (Thomas Calabro) finally reunite at 4616 Melrose Place. When Jonah throws a party at their old stomping grounds, each decides to crash it - with their own secret agendas, of course.
The L&O spin-off is back for its ninth season, and there are plenty of changes brewing in the Major Case Squad. Vincent D'Onofrio, Kathryn Erbe and Eric Bogosian prepare to exit as series regulars, but they've got one more case to work out before they go. Goren and Eames chase down a murderer who killed a wealthy businessman and his girlfriend. The businessman had been leading pirate-hunting expeditions off the coast of Africa, but his final target set off a complicated series of events with devastating consequences.
* Frontline (9/8c PBS)
Though it paled in magnitude to the late-February earthquake in Chile, the earthquake that hit Haiti early this year proved far more devastating in terms of deaths, damage and the emergency response. Reported by Martin Smith, this Frontline installment offers a first-hand look at what went right and, more often than not, wrong during the initial relief efforts.