1. Christian Bale
   John Stamos
2. Brad Pitt
   Mark Ruffalo

Pitt was married to Jennifer Aniston at the time he appeared on this Thanksgiving episode from season eight, called "The One with the Rumor." During the show, Will reveals that he and Ross created an "I Hate Rachel Greene Club" back in high school.

1. Julia Louis-Dreyfus
   Susan Sarandon
2. Lesley Ann Warren
   Sigourney Weaver

When Jessica Lockheart is killed off of "Days of Our Lives," Joey's comatose character, Dr. Drake Ramoray, receives her brain via a transplant surgery only a soap opera could come up with.

1. Charlie Sheen
   Emilio Estevez
2. Alec Baldwin
   Tom Selleck

In the season two episode, "The One With the Chicken Pox," Ryan and Phoebe reunite for a romantic two-week rendez-vous. Unfortunately, both have chickenpox and are itching wildly the entire time.

1. Christina Applegate
   Jennifer Coolidge
2. Winona Ryder
   Reese Witherspoon

As Melissa Warburton, Rachel "Ray-Ray" Green's old sorority sister, Winona Ryder shares a kiss with Jennifer Aniston in this much talked-about episode, "The One With Rachel's Big Kiss."

1. Meg Ryan
   Sandra Bullock
2. Sharon Stone
   Julia Roberts

This double-length episode aired right after Super Bowl XXX in 1996. Along with "The One Hundredth" and "The Last One," it's one of the few episode titles that does not reference an aspect of the show's plot.

1. George Wendt
   Danny DeVito
2. Jeff Goldblum
   Bruce Willis

In "The One Where the Stripper Cries," Monica and Rachel are surprised to learn that Phoebe wants a stripper at her bridal shower, so they hire the first person they find in the phonebook. Reportedly, DeVito came up with the stripper's hilarious dance routine himself.

1. Alec Baldwin
   Jerry Seinfeld
2. Stephen Baldwin
   Colin Firth

Baldwin appeared as Parker in two episodes from this season — "The One With the Tea Leaves" and "The One in Massapequa." Reportedly, the character was based on a real-life boyfriend of one of the show's creators.

1. Brad Pitt
   Tom Hanks
2. Bruce Willis
   Mark Harmon

Willis won an Emmy for Outstanding Guest Actor in a Comedy Series for his role as Paul Stevens. The character, who despises Ross and briefly dates Rachel, appears in three episodes of the show.

1. Johnny Depp
   Sean Penn
2. Robert Downey Jr.
   George Clooney

Penn appeared as Eric in two-episode from season eight — "The One with the Halloween Party" and "The One with the Stain." While Eric attempts to date Phoebe after learning Ursula lied to him, the fact that she looks just like her sister makes it too weird.

1. Reese Witherspoon
   Christina Applegate
2. Charlize Theron
   Laura Linney

Witherspoon appeared as Rachel's spoiled younger sister in "The One with Rachel's Sister" and "The One Where Chandler Can't Cry." Witherspoon and Aniston teamed up again, 19 years later, to star in the hit Apple+ show, "The Morning Show."

1. Charlize Theron
   Laura Linney
2. Christina Applegate
   Robin Wright

Applegate appeared in the season nine episode, "The One with Rachel's Other Sister," and the season 10 episode, "The One Where Rachel's Sister Babysits." Applegate won an Emmy Award for Outstanding Guest Actress in a Comedy Series for her first appearance as Amy.

1. Jennifer Coolidge
   Catherine O'Hara
2. Jane Lynch
   Busy Philipps

This episode from season 10, called "The One with Ross' Tan," is also well-known for its hilarious subplot, which features Ross attempting to get a spray tan but failing miserably.

1. George Clooney and Eriq La Salle
   Noah Wyle and Anthony Edwards
2. George Clooney and Noah Wyle
   George Clooney and Anthony Edwards

In "The One with Two Parts, Part 2," Clooney and Wylie play a pair of doctors who go on a double date with Monica and Rachel. At the time this episode aired (1995), "ER" was one of NBC's most popular shows.

1. Patrick Dempsey
   Josh Duhamel
2. Bradley Cooper
   Paul Rudd

Rudd appeared as Mike in 17 episodes of the last two seasons of "Friends." He's introduced in the season 9 episode, "The One with the Pediatrician," and is featured for the last time in the show's finale, "The Last One."

1. John Cleese
   Eric Idle
2. Hugh Laurie
   Colin Firth

"The One with Ross's Wedding" was the season finale of the show's fourth season. In the episode, Rachel flies to London to tell Ross, who is about to marry Emily, that she still loves him.

1. Robert Downey Jr.
   Brad Pitt
2. Ben Stiller
   Leonardo DiCaprio

Ross is horrified when he discovers that Rachel's date, Tommy, has a terrible temper and screams at people when she's not there. Eight years after this episode aired, Ben Stiller and Jennifer Aniston went on to star in the hit 2004 rom-com, "Along Came Polly."

1. Anna Faris
   Cameron Diaz
2. Drew Barrymore
   Charlize Theron

Faris appeared in four episodes of season 10, including the series finale, "The Last One." Fun fact: David Schwimmer directed the first episode featuring Faris, called "The One with the Birth Mother."

1. Demi Moore
   Brooke Shields
2. Sandra Bullock
   Nicole Kidman

Shields played Erika Ford, a crazy fan who thought Dr. Drake Ramoray, Joey's soap opera character, was a real person. This happened in the extra-long episode, "The One After the Superbowl," which also featured Julia Roberts's famous guest appearance.

1. Jerry Seinfeld
   Jason Alexander
2. Michael Richards
   Wayne Knight

In "The One Where Rosita Dies," Phoebe takes a job as a telemarketer, which is how she meets the unhappy office manager Earl. The show's subplot involves the death of Rosita, Joey's favorite chair.

1. Freddie Prinze Jr.
   James Van Der Beek
2. Josh Hartnett
   Joshua Jackson

Freddie Prinze Jr. is the son of Freddie Prinze, an actor and stand-up comedian who was popular in the 1970s. Tragically, he died in 1977 when Freddie Prinze Jr. was less than a year old.

1. Sarah Michelle Gellar
   Selma Blair
2. Mandy Moore
   Claire Danes

When Chandler has to spend the holidays in Tulsa because of work, Monica becomes jealous of his attractive new co-worker, Wendy. She's especially worried when she learns Wendy was a former Miss Oklahoma runner-up.

1. Kelsey Grammar
   Ted Danson
2. Jack Nicholson
   Jeff Goldblum

Goldblum starred in two of the highest-grossing films of the '90s — "Jurassic Park" and "Independence Day" — as well as indie hits such as "Igby Goes Down" and "The Grand Budapest Hotel."

1. Luke Perry
   Leonardo DiCaprio
2. Greg Kinnear
   Christian Slater

Ross finds himself in a bind in "The One with Ross's Grant" when he learns that the professor administering the grant he's up for, Dr. Benjamin Hobart, is an ex-boyfriend of his current girlfriend, Charlie.

1. Dana Carvey
   Kevin Nealon
2. Jon Lovitz
   Dennis Miller

Jon Lovitz is best known as a member of the "Saturday Night Live" cast from 1985 to 1990. He made a second appearance on "Friends" as the stoned restaurant-owner Steve in the season nine episode, "The One with the Blind Dates."

1. Cindy Crawford
   Elle Macpherson
2. Heidi Klum
   Naomi Campbell

Elle Macpherson appeared as Joey's new roommate and love interest Janine Lecroix in five episodes of "Friends." The character was introduced in the episode "The One Where Phoebe Runs" and made her last appearance in "The One with the Apothecary Table."

1. Mark Harmon
   Bruce Willis
2. Billy Baldwin
   Tom Selleck

Richard Burke was Monica's boyfriend during season two. The pair had a brief reunion in season three before breaking up for good. Selleck made his final appearance as Richard in season six, when he tried to get in the way of Chandler's marriage proposal.

1. Kate Moss
   Claudia Schiffer
2. Denise Richards
   Neve Campbell

All the guys lust over Cassie Gellar in this season seven episode, including cousin Ross. Richards was widely regarded as a sex symbol in the late '90s and early '00s thanks to her roles in movies like "Wild Things."

1. Rebecca Romijn
   Claudia Schiffer
2. Cindy Crawford
   Christy Turlington

In "The One with the Dirty Girl," Romijn plays Cheryl, a beautiful woman with an incredibly messy apartment. Ross tries to ignore the mess but is forced to leave when he discovers a rat running around the apartment.

1. Debbie Reynolds
   Mary Tyler Moore
2. Sally Field
   Marlo Thomas

Thomas appeared as Sandra Greene three times total — twice in season two and once in season eight. In her final appearance, "The One with the Baby Shower," she announces her plan to move in with Rachel to help her take care of her new baby.

1. Drew Carey
   Donny Osmond
2. Pat Sajack
   Howie Mandel

"Pyramid" was a revamped version of the popular 1970s game show, "The $10,000 Pyramid," which has had many iterations over the years. The version hosted by Donny Osmond aired from 2002 to 2004.

1. Drew Barrymore
   Soleil Moon Frye
2. Ashley Olsen
   Mary-Kate Olsen

Frye plays Katie, one of Joey's dates in this episode from season five. She's spunky, energetic, and unfortunately for Joey, freakishly strong. Every time she playfully punches him in the arm, it hurts.

1. Kristin Davis
   Cynthia Nixon
2. Sarah Jessica Parker
   Kim Cattrall

When this episode of "Friends" aired in November of 2000, "Sex and the City" had been on the air for two years. The hit HBO show ran until 2004 and was followed by two successful movies.

1. Pat Benatar
   Chrissie Hynde
2. Cher
   Annie Lennox

In "The One with the Baby on the Bus," Hynde played Stephanie Schiffer, a singer and guitarist hired to perform at Central Perk, much to Phoebe's dismay. The episode's title refers to the subplot in which Joey and Chandler accidentally leave baby Ben on a New York City bus.

1. Jason Priestly
   Matthew Lillard
2. Bruce Willis
   David Arquette

In "The One with the Jam," Arquette plays Malcolm, a young man who starts stalking Phoebe, believing she is Ursula. Arquette and Courteney Cox married in 1999. The couple, who also starred together in the "Scream" movies, split in 2013.

1. Liam Neeson
   Arnold Schwarzenegger
2. Jean-Claude Van Damme
   Sylvester Stallone

In "The One After the Superbowl," which features several celebrity guests, Monica and Rachel meet Jean-Claude Van Damme on the set of the movie he is filming on location in New York City.