The New Adventures of Old Christine | 8pm on CBS

The fourth season concludes with Christine and Papa Jeff (Scott Bakula) rekindling their feelings for one another at Richard’s wedding, but then Christine learns some outrageous news.

Desperate Housewives | 9pm on ABC

Season Finale: Gaby meets up with an old acquaintance who has lost everything; Lynette is upset about Tom’s latest bright idea; Orson threatens to blackmail Bree; Gaby’s niece moves to Wisteria Lane; Susan and M.J. are in grave danger.

21 | 9pm on Starz

Students from the Massachusetts Institute of Technology become experts at card-counting and use the skill to win big at Las Vegas casinos. Based on “Bringing Down the House” by Ben Mezrich.

The Office | 9pm on NBC

Season Finale: Michael reunites with Holly (Amy Ryan) at Dunder Mifflin’s annual company picnic while the rest of the staff competes in a volleyball tournament.

Fringe | 9pm on FOX

Season Finale: The first-season finale includes an appearance by the much-discussed, but never seen, Massive Dynamics founder, William Bell (Leonard Nimoy), the return of David Robert Jones and a mysterious vanishing act by Walter.

Once | 8pm on HBO Signature

An Irish street musician and a Czech immigrant collaborate on a number of songs that reflect the story of their blossoming love. Glen Hansard, Marketa Irglova, John Carney, John Carney, Martina Niland

Sit Down, Shut Up | 8:30pm on Fox

Miracle distributes what she thinks are flowers to the staff to celebrate spring; Helen’s grudge against Sue jeopardizes the school’s spring fundraiser

Waitress | 9pm on More Max

A pregnant waitress is caught between her controlling husband and the new town doctor, with whom she is having a steamy affair. Keri Russell, Nathan Fillion, Cheryl Hines, Adrienne Shelly, Lew Temple

The No. 1 Ladies’ Detective Agency | 8pm on HBO

A young woman worries about her unusually fearful father; a doctor asks for an investigation into his patients’ mysterious deaths.

Independence Day | 8pm on A&E

Aa disparate group of individuals and families converge in the Nevada desert and, along with the rest of the human population, participate in a last-chance retaliation against aliens.

Never Back Down | 9pm on Starz

At his new high school, a rebellious teen is lured into an underground fight club, where he finds a mentor in a mixed martial arts veteran. Djimon Hounsou, Sean Faris, Amber Heard, Cam Gigandet, Leslie Hope

ER | 8pm on NBC

Series Finale: At 8pm ER takes a look back at the series with clips & interviews with past and present stars. And at 9pm, in the final episode, Gates treats a young teen with alcohol poisoning; old friends come to show their support when Dr. Carter opens a medical facility for the underprivileged; Sam gets […]

Cupid | 10pm on ABC

Trevor, who believes he’s Cupid, the Roman god of love-is released from a three-month stint in a mental institution on condition that he attends a therapy group led by psychiatrist Claire McCrae. He picks up with the same case that put him in the lockup: connecting a street musician with his true love, whom he […]

Moulin Rouge | 8pm on IFC

In 1890s France a courtesan falls in love with a young writer but strings along a duke who can finance improvements to the night spot. 

The Biggest Loser | 9pm on NBC

The players pull cars loaded with extra weight assigned to them by their teammates in a challenge featuring NASCAR’s Clint Bowyer. Later, the teams are dissolved, leaving the contestants to compete as singles; a player breaks a record at the weigh-in.