"Veronica Mars" (9 p.m., UPN): "Veronica Mars" moves back to its original night and time for the

"Veronica Mars" (9 p.m., UPN): "Veronica Mars" moves back to its original night and time for the remainder of the season with an episode that has our heroine being haunted by the bus-crash victims. Apparently, they start showing up in her dreams and conveying information about what might have happened in this season's pivotal tragedy.
"The Unit" (9 p.m., CBS): Among the huge flood of midseason shows, "The Unit" is one of the few shaping up to be a keeper. In tonight's episode, the team goes undercover in the Russian embassy in Israel to prevent shady diplomats from secretly supplying would-be terrorists with nuclear material.
"When America Was Rocked" (9 p.m., The History Channel): This special examines the cultural fallout from Elvis Presley's Sept. 9, 1956, appearance on "The Ed Sullivan Show," which kicked off a new culture encompassing teenage independence, sexuality, race relations and a rocking new form of music.
"Gold Rush" (10 p.m., The History Channel): This special explores the Jan. 24, 1848, discovery of gold and its impact on the explosive development of California. For the first time in history, anyone -- not just kings or sultans -- could have gold for the taking, inspiring tens of thousands of fortune seekers to make the arduous journey West.
"Protocols of Zion" (7 p.m., Cinemax): This documentary examines the influence of the anti-Semitic propaganda text, "The Protocols of the Elders of Zion."
"Gilmore Girls" (8 p.m., The WB): Not only has Rory's ex-boyfriend (Milo Ventimiglia) learned to read, but he's also opened up a bookstore.