TONIGHT'S MUST-SEE

"Will & Grace" finale, 8 p.m., NBC; preceded by "Will & Grace: Say Goodnight, Gracie" at 7 p.m. In recent years, "Will & Grace" has sometimes settled for buffoonery. It had loud jokes, loud characters and easy laughs. But in the early years, when creators Max Mutchnick and David Kohan were there, the show crackled. It had witty lines, delivered by talented people and guided by TV's best comedy director, James Burrows. Now we get an hour-long documentary filled with clips and comments. That includes a look at the show's guest stars, including Madonna, Britney Spears, Michael Douglas and Cher. And Mutchnick and Kohan are back to lead the finale. They have lots of things to settle. Will, who is gay, and Grace, who is not, are planning to raise her baby together. But tonight's episode also includes her ex-husband Leo (Harry Connick Jr.) and Will's ex-boyfriend Vince (Bobby Cannavale). We also must worry about Karen, Jack and Karen's maid, Rosario. It could be a busy night.

OF NOTE

"American Inventor," 7 p.m. rerun and 8 p.m. finale, ABC. Last week's episode — which reruns at 7 p.m. — had the four finalists create commercials for their inventions. Then viewers voted. Now the finale declares a $1 million winner.

"CSI," 7 and 8 p.m., CBS. With "Survivor" over, "CSI" gets an extra hour. At 7 p.m., it has a rerun in which a motorcycle racer is stabbed in his garage. At 8, in a new episode, one of the CSI team struggles for life while colleagues work on two disturbing cases.

"That '70s Show" finale, 7 p.m., Fox. Last week, Eric's parents startled everyone by saying they were moving from Wisconsin to Florida. Now they have second thoughts; meanwhile, Kelso is back to celebrate New Year's Eve.

"The O.C.," 8 p.m., Fox. It's high school graduation time for Ryan, Seth, Marissa and Summer. Meanwhile, things are affected by Ryan's mom, Marissa's sister, Seth's dad and others.

"Without a Trace," 9 p.m., CBS. A man in for questioning grabs Jack's gun, shoots around the office and then departs with a hostage.

"ER," 9 p.m., NBC. Guns keep showing up in bad places tonight. In this show, shots are fired in the emergency room. Kovac and Abby end up in danger; meanwhile, Neela tries to comfort Gallant's parents, played by Sheryl Lee Ralph and Ernie Hudson.

TONIGHT ON KHNL NEWS 8

The lights go down, the music pulsates and the crowds flock to their domain—the clubs, the hangouts, the rendezvous. KHNL News 8 looks deep inside and behind the scenes of where Honolulu goes after dark. It's a special report every Thursday in May. Tonight on KHNL News 8 at 10.