A screenwriter trying to combine “Xena: Warrior Princess” with “Braveheart” could not have invented a story more compelling than “Warrior Queen Boudica” (7 p.m., History). A true tale of first-century Britons rebelling against Roman occupation, “Boudica” combines interview footage, computer graphics and often-rousing battle-scene re-enactments involving thousands of actors in Roman centurion garb as well as ragged get-ups of Britons and Celts.

After Caesar’s legions first occupied Britain, tribes, including Boudica’s Iceni people, cut deals with Rome that allowed them to retain their sovereignty, dignity and ancient ways. But after the death of Boudica’s royal husband, the Romans took a tougher stance with the Iceni. When Queen Boudica balked, she and her two daughters were seized, raped and flogged publicly.

¢ A very special “Late Night With Conan O’Brien” (11:30 p.m., NBC) offers highlights of his “state visit” to Finland. For those who haven’t been paying attention, Conan has fixated on his supposed resemblance to Finland’s President Tarja Halonen.

O’Brien has made several fake commercials endorsing his female double. For their part, Finns have embraced Conan’s tongue-in-cheek interference with their internal politics. He was greeted at the airport with placards declaring: “Halonen is our president. Conan is our king!”

¢ Laura (Mary McDonnell) contemplates stealing the election to defeat a Cylon collaborator on the 90-minute season finale of “Battlestar Galactica” (9 p.m., Sci Fi).

¢ The Discovery Channel kicks off three nights of survival-themed programming, beginning with “I Shouldn’t Be Alive: Trapped by a Boulder” (8 p.m.) and “Ultimate Survival” (9 p.m.).

¢ Denise Richards (“Starship Troopers”) turns to the “Dog Whisperer” (7 p.m., National Geographic) to restore domestic tranquility and help her get through her three-dog nights.

Tonight’s other highlights

¢ An angry magician learns about his less-than-stellar exit on “Ghost Whisperer” (7 p.m., CBS).

¢ ‘Tweens in bright-colored clothes go on spring break in the hourlong “Zoey 101” (7 p.m., Nickelodeon), starring Jamie Lynn Spears.

¢ Cliques clash in the singing-and-dancing 2006 bauble “High School Musical” (7 p.m., Disney). The movie’s soundtrack has become a big seller.

¢ An ex-con is accused of a break-in on “Close to Home” (8 p.m., CBS).

¢ A petty thief offers up a big secret on “Las Vegas” (8 p.m., NBC).

¢ A cop-killing case returns Conti to his old stomping grounds on “In Justice” (8 p.m., ABC).

¢ A psychic falls under suspicion on “Numb3rs” (9 p.m., CBS).

¢ A teen killer is charged as an adult on “Conviction” (9 p.m., NBC).

¢ Scheduled on “20/20” (9 p.m., ABC): heavy drinking on campus; an interview with Macaulay Culkin.

¢ Adrian raises Novocain after he suspects a dentist of murder on “Monk” (9 p.m., USA).

¢ “True Grit” (9 p.m., CMT) profiles NASCAR pioneer Junior Johnson.