Eric McCormack Upcoming Appearances

When two pals ask Will and Grace to be the best man and maid of honor at their wedding, Grace s sexy past with the groom is exposed. Rob: Tom Gallop. Ellen: Leigh-Allyn Baker.

Speeding lands Karen a ticket from a stoic cop (Bobby Cannavale), whose court appearance holds a surprise for Will. Another revelation stems from Jack s mistrust of Stuart, espied in a movie theater with a much younger fellow.

Bebe Neuwirth plays herself in a spoof that finds Jack and Karen bemoaning the ends of “Frasier,” “Friends” and “Sex in the City.” Meanwhile, Will s challenged by a fling with a cop (Bobby Cannavale). Nonny: Sharon Osbourne.

Will and Grace are alarmed when the friendship of two bickering oldsters mirrors their own; Ben (Gregory Hines) impresses Jack and Karen with his hidden talents. Sharon: Piper Laurie. Professor Dudley: Orson Bean. Phil: Gary Beach.

Grace meets Vince, but abruptly leaves shortly after; Jack auditions replacements for Karen because he thinks her marriage will end their friendship. Vince: Bobby Cannavale. Phyllis: Amy Farrington. Jack: Sean Hayes. Karen: Megan Mullally.

Will learns his dad is cheating on his mistress (Lesley Ann Warren)...with Will s mother (Blythe Danner); Jack s son tries out for cheerleader. Elliot: Michael Angarano. Melanie: Sara Paxton. Will: Eric McCormack. Jack: Sean Hayes. Karen: Megan Mullally.

Conclusion. After his legal tussle with Karen, Jack moves in with Will, who is reeling from reversals in his career and love life. Ben: Gregory Hines. Alex: Donald Berman. Houseboy: Michael Edward Thomas.

Graduation jitters jolt Jack, named the Most Popular Student Nurse and tapped to deliver a speech that Will fills with murky metaphors. “If you don t hold on tight,” Will writes, “[dreams] will slip away.”

Part 1 of two. It s wedding bells for Karen and Lyle, readying for a Las Vegas wingding. Jennifer Lopez appears briefly as herself; Tim Curry plays Lyle s lecherous brother. Lyle: John Cleese. Leo: Harry Connick Jr.

Will s apartment becomes a sassy snakepit after a break-in at Grace s place drives her to move in with him and Jack. Meanwhile, a feuding Jack and Karen kvetch and make up. Mipanko: Derek Basco. Brian: David Lee Russek.

Conclusion. Jennifer Lopez sings and dances at Karen and Lyle s wedding in a glitzy number that features Jack in the chorus. Marion: Tim Curry. Leo: Harry Connick Jr. Lyle: John Cleese. Beverley: Leslie Jordan.

Jennifer Lopez shares some rowdy scenes with Jack and Karen, pitching J-Lo a ballad Kar wrote. Meanwhile, Leo s infidelity tests Grace. Leo: Harry Connick Jr. Subway Passenger: Jason Landau. Directed by James Burrows.

At Grace s interior-design firm, an impressionable new intern (Natasha Lyonne) causes chaos by emulating Karen. Meanwhile, Will and Jack muck up a gay-sensitivity seminar for local cops. Terry: Suzanne Krull. Annie: Henriette Mantel.

Janet Jackson spoofs herself, pitting Jack in a dance-off for a backup-dancer gig against an aging trouper: Karen s ex-lover (Will Arnett). Vince: Bobby Cannavale. Lieutenant: Steve Ryan. Choreographer: Andrew Ableson.

Free food lures Grace to AA, where she links up again with wacky Val (Molly Shannon); a new gay TV network relishes Jack s earthy ideas. Like a nude variation of “Jeopardy.” Tim: Mark Harelik. Mitchell: Jon Kinnally.

Bebe Neuwirth plays herself in a spoof that finds Jack and Karen bemoaning the ends of “Frasier,” “Friends” and “Sex in the City.” Meanwhile, Will s challenged by a fling with a cop (Bobby Cannavale). Nonny: Sharon Osbourne.

A “Cyrano de Bergerac”-style plot has Jack borrowing Will s words to impress a crush (Patrick Dempsey), while an ex (Jeremy Piven) asks an amazed Grace to join him in a threesome with his new lover (Maria Pitillo).

A new upstairs neighbor (Stephen Tobolowsky) riles Grace; bad vibes beset Jack, who s working as an exec at a gay TV network, where he s unnerved that “everyone is so smart.” Tim: Mark Harelik. Jimmy: Sam Pancake.

A birthday party for Will (who s 40 going on 37) is an uneasy celebration, thanks to a symbolic gift from his new lover that betokens commitment. The strangest present: a nude portrait of Will that s lacking in certain details.

The conclusion of a flashback to a memorable Thanksgiving in 1985 reveals how Will and Jack became pals; and how Karen ended up with hubby Stan. Bobbi: Debbie Reynolds. Martina Navratilova plays herself in a cameo.

Benson and Stabler question the CEO of an online-dating service (Eric McCormack) after discovering a member s body stuffed inside a suitcase.

Kristin Davis (“Sex and the City”) plays a doting soul mate of Will s lover, whose sweetness belies a deep-rooted jealousy. Meanwhile, Karen s stint as Jack s assistant at OutTV proves disastrous. Vince: Bobby Cannavale. Tim: Mark Harelik.

Will and Jack do battle over the same lover (Paul Fitzgerald), while a freaked-out Grace learns she has a “six-toe beau” (Ken Marino).

Part 1 of two. Memories of Leo haunt Grace as their wedding anniversary nears and she readies to get back in the dating game. Meanwhile, Karen and Jack fix each other up on dates, which, of course, turn out disastrously.

Divorce angst ruffles Grace in this two-parter s conclusion, which also concerns Jack s plan for a has-been commercial star (Victor Garber), signed up as an OutTV spokesman. Rip Taylor has a cameo as his irrepressible self.

A marital crisis upsets Grace, who reluctantly confides in Will after leaving Leo in Cambodia; nursing school flusters Jack, intimidated by a no-nonsense instructor (Lea Delaria) who gets set straight by Karen.