Will & Grace

When Jennifer Lopez sang at Karen's (Megan Mullally) wedding, finds Lopez back in New York after concluding her concert tour.

Jack dances with Janet Jackson.

After Jack (Sean Hayes) took off as a backup dancer with iconic pop star Jennifer Lopez in last season's finale, he now reappears in the same role - but as part of Jackson's performance tour. Elsewhere, Will (Eric McCormack) and Grace (Debra Messing) try to get back to business as usual and mend Grace's broken heart.

Grace (Debra Messing) has a surprise reunion with Val (guest star Molly Shannon) as she attempts to steal doughnuts at an AA meeting. She gets hooked on AA meetings for free therapy and food and Val and Karen (Megan Mullally) have a confrontation which leads to Grace's exposure as a fraud.

Grace has a surprise reunion with Val.

When Will (Eric McCormack) and Grace (Debra Messing) meet a stranger named Ned in the elevator, Grace accuses Will of being too nice to people he doesn't know. While Grace befriends Ned and invites him to dinner, Will makes some nasty remarks about him, but they soon discover that Ned's not the best company to keep.

It's Will's (Eric McCormack) birthday and everyone is in the mood for a happy birthday celebration, although Will is a bit hesitant because he has never had a happy birthday. Now that he is in a good relationship with his new boyfriend Vince, Will decides to give his birthday a chance.

Will (Eric McCormack) convinces Jack (Sean Hayes) to help a local gay bookstore owner save his store from closing. Meanwhile, Graces' (Debra Messing) first design job after her divorce is for a young, obnoxiously- in-love newlywed couple.

When Will (Eric McCormack) and Grace (Debra Messing) meet Vince's (guest star Bobby Cannavale) best female friend, Nadine (guest star Kristine Davis), they notice some striking similarities with their own relationship.

Grace (Debra Messing) comes home from a great date and listens to a staticy message she's received from Leo. She thinks Leo is telling her happy anniversary and that he wants to meet on the top of the Peninsula hotel as they had always planned.

Will (Eric McCormack), Grace (Debra Messing), Jack (Sean Hayes) and Karen (Megan Mullally) go on a road trip for Grace's get away weekend - a weekend devoted to not mentioning the name "Leo." Jack and Karen hate the car ride and decide to bail on the plan.

When Vince's (guest star Bobby Cannavale) mother injures her leg and is unable to make her traditional Italian Thanksgiving, Will (Eric McCormack) comes to the rescue by offering to make his own special dinner, but Vince's mother refuses to give Will any credit. Part 1 of 2.

When Vince's (guest star Bobby Cannavale) mother injures her leg and is unable to make her traditional Italian Thanksgiving, Will (Eric McCormack) comes to the rescue by offering to make his own special dinner, but Vince's mother refuses to give Will any credit. Part 2 of 2.

Grace (Debra Messing) attends a holiday party at Will's mother Marilyn's (guest star Blythe Danner) home and accidentally breaks a treasured Lladro figurine. Will convinces Grace not to tell his mother and to blame the accident on one of the other guests at the party.

Scott Woolley (guest star Jeff Goldblum), an old high school classmate seeks revenge on Karen (Megan Mullally) for ruining his senior year by trying to become President of Walker Inc. After Scott prepares a presentation that wows the board of Walker Inc., he takes over control of the company, much to Karen's dismay.

Will is up for partner at his law firm. His boss, Margot, invites the candidates for partner to a dinner at her house, where she will ultimately make the final decision. Will, who is worried that Vince (guest star Bobby Cannavale) will ruin his chances of getting the promotion, is reluctant to bring him as his date.

Scott Woolley (guest star Jeff Goldblum), Karen's nemesis, hires Grace (Debra Messing) to design his new restaurant under the condition that Grace fires Karen (Megan Mullally) from her design firm. Grace later tells Karen about the incident and they realize the man that hired Grace is really Scott Woolley.

Valentine's Day is full of surprises. Grace's (Debra Messing) tries to ignore the greeting card holiday but romantic urges eventually send her into the arms of the enemy - none other than Nick (guest star Ed Burns, "Saving Private Ryan") a hunky greeting card writer.

Grace (Debra Messing) drags Will (Eric McCormack) along to keep her in check during her first date with Nick (guest star Edward Burns) only to leave a heated Will at his table for one.

Will (Eric McCormack) agrees to fire Karen's (Megan Mullally) pastry chef until the baker cooks up a delectable love triangle for the three of them.

Jack (Sean Hayes) convinces Will (Eric McCormack) that they need a change of scenery and should buy a vacation home in Loudon Falls, an up-and-coming gay community. After purchasing a new pad, the duo find out that it is not quite the gay getaway they had imagined.

When Will convinces Grace (Debra Messing) to see his therapist, Dr. Georgia Keller (guest star Sharon Stone), he becomes increasingly jealous when the two women form an instant friendship. Grace and Will begin to compete fiercely for Georgia's attention - and a place in her upcoming book.

When Grace (Debra Messing) convinces Karen (Megan Mullally) to accompany her to her father Martin's (guest star Alan Arkin) birthday bash, the situation turns awkward when it is just the three of them.

After a near-death experience in a jean boutique, Grace decides to write her will and enlists Will's legal expertise. To make sure she's fair when bequeathing her money, Grace visits Will's mother (guest star Blythe Danner) to find out how much Will plans to leave her and is shocked by what she finds.

Having quit his job at the law firm, Will (Eric McCormack) turns to a career in writing where he catches the eye of Malcolm (Alec Baldwin), who claims he has high-profile connections. But when his writing career fails, Malcolm has another job offer for Will.