Mary Steenburgen and Ted Danson
Larry's always been enamored of Mary and suspicious of Ted, who's a far less endearing version of his national-treasure self ("He is an arsehole," Lucy Lawless agrees with Larry at one point), and he's not too happy when—down the road—a recently separated Ted starts dating Cheryl (Cheryl Hines). So he attempts to ask Mary out and is quickly apprised of the fact that he's not on her dating level.
Meanwhile, the real Ted and Mary have been married since 1995.
Kathy Griffin
"We did nothing to each other but just every week I end up writing her an apology letter," talent manager Jeff Greene (Jeff Garlin) explains why he's writing to the My Life on the D-List star. She runs into Larry and Jeff at a restaurant later, unaware that by then a tangled web has been woven around a lie about Jeff not passing on a message to Larry that she wanted him to write a pilot for her.
Shaquille O'Neal
After Shaq is injured during a Lakers game when he trips over Larry's outstretched foot, Larry hears he's a huge Seinfeld fan—literally, really—and tries to make amends by sending him the complete series while the NBA star recuperates in the hospital.
On VHS, because 2001.
Wanda Sykes
Cheryl's good friend never holds back when it comes to telling Larry what she thinks, usually of his latest misstep.
In season five Larry briefly has a dog that at first only seems to get aggressive around Black people. "Have you trained the dog to hate Black people?" Wanda asks Larry suspiciously. "Where'd you get this dog, a Klan meeting or something?"
Richard Lewis
Playing a more neurotic version of himself, the comedian recurs as one of Larry's closest friends whom he also almost always has a grievance with. But he does give Lewis a kidney at the end of season five, changing the nature of their relationship not a bit.
Joan Rivers
The late legend played her red carpet-ruling self at Curb's staging of the Emmys, where Lewis reluctantly brings the latest love of his life, who's been disfigured by a violent allergic reaction to peanuts. (An allergy that Larry never told Cheryl about, so when they had the couple over for dinner there could have been peanut oil or peanut traces in the meal.)
"Oh my god, I've seen better faces on a hemorrhoid," Joan blurts out when she glimpses his date. "When ET called home, did she pick up the phone?" Then, as they're scurrying away, "How are things in Loch Ness?!"
Paul Reiser
When Larry and Cheryl hear from Wanda that there's a 90-percent chance of an imminent terrorist attack on Los Angeles in this 2002 episode, much philosophizing ensues over who are the friends you tell in order to save them, while keeping other people in the dark so as not to cause hysteria.
But it's the same weekend of this big charity benefit for the National Resources Defense Council...
Meanwhile, Larry failed to say hello or any word at all to Reiser's wife, Mindy (Linda Bates), when he and Cheryl ran into them at a restaurant, so he tries to make up for it by telling her about the rumored terrorist threat (which turns into another slight when Mindy mentions how their invitation to the benefit must have "got lost in the mail").
Martin Short
While mid-conversation with Mindy at her upscale beauty boutique, Larry cluelessly runs outside when he sees Marty walking by. The Canadian-born entertainer is more than happy to unleash a slew of funny voices in an impromptu performance, but Mindy has had it after the additional snub.
Alanis Morissette
Count Larry among the few souls who knows what man "You Oughta Know" is about after Alanis feels comfortable confiding in him. But that's before she gets whiplash when her car is bumped into by the angry host of the first, spoiled benefit that no one showed up to because everyone was scared away by Mindy blabbing about the attack.
The show does go on, but with a neck-brace-wearing, off-key Alanis.
To keep making up for his carelessness, Larry then tells Mindy the "You Oughta Know" secret. Surely a sound decision.
Rosie O'Donnell
The comedian and talk show host shows up several times, first in season five when, after Larry has upset the gay community, she informs him that she has happily vouched for him. "Lesbians love you," she reassures him.
In season seven she joins Larry and Jeff for lunch, telling Larry it might be a little "mean and insensitive" to deliver really bad news directly after sunshiny news. Then a vicious battle for the check between Larry and Rosie ensues, one of many tug-of-wars over a restaurant bill that has ensued over the years.
The next season she runs into him at an art gallery, where they find out they've both met and swooned over the same woman that night. Needless to say, they can't agree on who should be the one to "back away."
Martin Scorsese
Larry gets cast in a mob movie being directed by the Oscar-winning filmmaker, who tries to be as patient as possible with the opinionated actor. "You know, [with] Seinfeld, we did two takes and we were done," Larry helpfully informs the director of Goodfellas and The Departed.
Ben Stiller and Christine Taylor
Ben's going to play Leo Bloom to Larry's Max Bialystock in the staging of The Producers that takes over season four, but a disastrous appearance at Ben's "no gift" birthday party (literally everybody else brings one but Larry—who can't let it go that Ben's having a party two weeks after his actual birthday, and Ben stares Larry down when he sees he's not singing "Happy Birthday") ends in Larry accidentally sticking a cocktail skewer in the actor's eye because he's too busy worrying where to put it to actually get rid of it.
"What did you do?!" Christine asks their faux-pas-amassing guest.
And so the Meet the Parents star must exit stage left.
David Schwimmer
Intense and humorless, at least around Larry, it's obvious the Friends star doesn't care for his co-star in The Producers. Now, that could have something to do with Schwimmer's onscreen father being in the raisin-cashew snack bag business—and Larry's myriad complaints that there aren't nearly enough cashews for his liking.
Nathan Lane
Freaking out before opening night, Larry seeks out his predecessor in The Producers for a pep talk in a blink-and-you-missed it sequence. Let's say, Lane is glad to see him go.
Cady Huffman
Larry's about to cash in his one-time anniversary hall pass with his alluring co-star in The Producers, but then the stalwart Democrat notices the picture of President George W. Bush in her dressing room. The look on his face puts an end to that.
Mel Brooks & Anne Bancroft
In the art-reflects-art plot, it turns out that comedy icon Brooks only cast Larry in The Producers because he's tired of the damn thing and assumed the Seinfeld creator, not a song-and-dance man at all, would be terrible and the show would be a Springtime for Hitler-esque flop. Alas, just as he and his wife are celebrating their success-by-failure... Larry's a hit.
Kevin Nealon
Poker night at the former Saturday Night Live star's house takes a turn when he finds out his brother-in-law—a Japanese-American artist whom Larry (spoiler alert) had offended by insisting that his father hadn't been a real Kamikaze pilot during World War II—attempted suicide.
Nealon's a little appalled to find out the guys kept playing and eating pizza while he was at the hospital.
George Lopez
While visiting Lewis in the hospital, Larry and Jeff run into George, who mentions his own kidney transplant (true story) and informs the two of them that it's basically up to either Lewis' friends or family to donate and save his life. At the same time, he also mentions that he's heard "the guy who's the head of the kidney consortium can be gotten to."
Attempted bribery troubles ensue.
John McEnroe
Due to a certain sequence of events, Larry ends up behind the wheel of the limo that the chauffeur was too drunk to drive him home in the night before. When the driver calls begging him to do a pickup at the airport in order to save his job (and with it his disabled wife's health care), Larry reluctantly agrees. His passenger: the infamously volatile tennis great, who really doesn't want to chit-chat with his talkative driver.
Lucy Lawless
Larry breaks a signed photo of the Xena: Warrior Princess star that was hanging on the wall of his dry cleaner's shop and he and Jeff promise to replace it, this time made out to "Zev." She even comes into the shop to sign in person, and Larry—fresh from Cheryl leaving him due to his chronic inconsiderateness—successfully asks Lucy out on a date. Even taking her to a restaurant that has decided its Team Cheryl doesn't faze her, but assuming she has invited him back to her house for more than dinner does.
John Legend
The EGOT winner graced Curb with his presence in season five, singing at Sammi Greene's (Ashly Holloway) Bat Mitzvah. But John Legend doesn't have an evil twin, so he's just his normal lovely self.
Christian Slater
Larry busts the Mr. Robot star for heaping too much caviar on his cracker during a party at Ted and Mary's house, breaking one of the myriad "unwritten laws" that Larry is the arbiter of. And he certainly didn't want Mary to think he had done it, and he has no problem pointing the finger at Slater.
(And it really was an egregious amount of caviar.)
Dr. Phil McGraw
Larry happens to catch an episode of Dr. Phil featuring a doctor (Sharon Lawrence) who talks about how she would advise a person battling cancer to leave a toxic partner. Hoping to put the idea into Loretta's (Vivica A. Fox) head that she should leave him, Larry having originally planned to break up with her before finding out that she had cancer, he arranges to bring her to that doctor.
Cast of Seinfeld
Never does Larry and his ways make more sense than when he's reunited with kindred spirits Jerry Seinfeld, Jason Alexander (who's excited to "make up for the finale"), Julia Louis-Dreyfus and Michael Richards (who doesn't know what he's agreeing to because of all the nude art on the walls of the restaurant where they meet to discuss it) for a Seinfeld reunion special, the making of which anchors season seven.