Clash of convictions on ‘Numb3rs’ finale

Tonight’s must-see

“Numb3rs,” 10 p.m., CBS.

CBS seizes our attention tonight, with three straight season finales.

For “Numb3rs,” that marks the departure of Diane Farr. Farr – who was terrific in two Denis Leary shows (“The Job” and “Rescue Me”) – plays Megan Reeves, who finds her political convictions clashing with her job in the FBI.

One of Charlie’s college colleagues had been arrested as a suspected terrorist. That creates conflict between Charlie and his brother, the FBI agent.

Tonight’s must-see II

“ET” (1982), 8-10:30 p.m., Nickelodeon.

Fridays are family-film night on cable and here’s the ideal. Brilliantly directed by Steven Spielberg, it’s the perfect blend of action, warmth and humor.

A lonely lad meets an alien who was accidentally left behind. He tries to help, but officials intervene; then the excitement grows.

Other choices include

“Dodgeball: A True Underdog Story” (2004), 8-10 p.m., Fox. Here’s a comic takeoff on movies about unlikely sports winners. Vince Vaughn needs a winning dodgeball team, to keep a competitor (Ben Stiller) from getting his gym.

“America’s Funniest Home Videos,” 8-10 p.m., ABC. Here’s the finale of the 18th season. Yes, 18; “Home Videos” is tied for No. 12 on the all-time list of primetime shows.

“Ghost Whisperer” season finale, 8 p.m., CBS. Melinda learns why her father (Martin Donovan) left and why her mom (Anne Archer) kept it a secret.

“Moonlight” season finale, 9 p.m., CBS. An overenthusiastic vampire has killed someone during passion. Now there’s an investigation; other vampires link to defend themselves.