57 celebrities you probably forgot guest-starred on 'How I Met Your Mother'
- CBS' "How I Met Your Mother" premiered in 2005 and lasted for nine seasons.
- Plenty of celebrities appeared throughout the sitcom's run.
- Jennifer Lopez, Joe Manganiello, Carrie Underwood, and Britney Spears guest-starred on "HIMYM."
Joe Manganiello had a recurring role as Brad, one of Marshall's friends from law school.
Brad and Marshall became closer after their girlfriends broke up with them. On season two, they went to brunch together and Marshall was teased by Ted and Robin for his newfound bromance.
"Glee" actress Jayma Mays guest-starred as a coat closet attendant at a club.
Ted bonded with her but forgot to exchange phone numbers.
"The Wonder Years" star Danica McKellar played Trudy on one of the series' most puzzling episodes — "The Pineapple Incident."
Ted spent the entire episode trying to piece together details from a night when he got drunk and couldn't remember anything.
Busy Philipps later appeared as Trudy's friend, Rachel.
They were sorority sisters who Ted may or may not have had a threesome with.
David Burtka, Neil Patrick Harris' real-life husband, had a recurring role as Scooter.
He was Lily's old high school boyfriend and repeatedly tried to win her back on several episodes.
Ted asked a student named Penelope, played by "Alias" star Amy Acker, to help him do a rain dance.
Penelope was studying Native American culture. Ted hoped that if they made it rain, it would prevent Robin from going on a trip with her coanchor, Sandy Rivers.
Jane Seymour played Professor Lewis, one of Marshall's teachers at law school.
She went through a divorce, and Marshall was convinced that was the reason why she was a harsh grader.
"Gotham" actress Morena Baccarin played Chloe, a barista who had a crush on Marshall.
Barney and Ted warned Marshall that Chloe had "crazy eyes" and said he should be cautious.
Comedian Wayne Brady appeared throughout the series as Barney's half-brother, James.
James identified as gay and went on to get married — a milestone that initially disappointed Barney.
"Pretty Little Liars" star Lucy Hale played Robin's younger sister, Katie.
She first appeared on season two and returned for Robin's wedding during season nine.
Fellow "PLL" star Ashley Benson also had a role on "HIMYM."
She played 20-year-old Carly, who briefly dated Ted — and turned out to be Barney's half-sister.
"Breaking Bad" actor Bryan Cranston guest-starred as Ted's demeaning boss, Hammond Druthers.
Lily tried to teach Hammond a lesson by stealing one of his prized possessions.
Cranston isn't the only "Breaking Bad" cast member who showed up on "HIMYM." Bob Odenkirk also appeared on a few episodes.
His rough disposition and the way he treated his coworkers (including Marshall) earned him the nickname "Artillery Arthur."
"The Price Is Right" star Bob Barker appeared as himself and was the first of many game show hosts to appear on the show.
Barney believed Barker to be his father, and went on "The Price Is Right" to confront him.
"The Vampire Diaries" star Candice King looked unrecognizable with red hair on season two.
She played Lily's cousin named Amy, who was in beauty school. She gave Marshall frosted tips shortly before his wedding to Lily.
Enrique Iglesias serenaded Robin as Gael, a man that she met in Argentina.
All the women at MacLaren's were drooling over him.
Ted got drunk with a girl named Amy — played by Mandy Moore — and woke up the next morning with a butterfly tattoo on his back.
Throughout the episode, Moore's character mocked and made fun of Barney.
"Grey's Anatomy" actress Abigail Spencer's character was simply referred to as "Blahblah" — because Ted couldn't remember her name.
She and Ted briefly dated after meeting online.
On season three, "Star Trek" actor John Cho's character successfully convinced Marshall to join his company.
Shortly after joining, Marshall resigned because he didn't agree with the company's environmental policies.
In 2007, model Heidi Klum made an appearance as herself.
Klum met Barney at a Victoria's Secret after-party, and gave him some love life advice.
"Scrubs" actress Sarah Chalke starred as Stella, the woman who would break Ted's heart and leave him at the altar.
She left Ted to be with her ex-husband and the father of her daughter, Lucy.
Britney Spears guest-starred as Abby, a receptionist at the dermatologist office where Ted's future fiancée worked.
She ditched her glasses and dressed up in an attempt for Ted to notice her.
Smulders' real-life husband Taran Killam appeared on a few episodes.
His character, Blauman, was part of the legal department at Goliath National Bank, where Barney and Marshall also worked.
"Dawson's Creek" star James Van Der Beek played Robin's first boyfriend Simon, from her days as a teen pop sensation in Canada.
Simon and Robin met on the set of her music video for "Sandcastles in the Sand."
"Growing Pains" actor Alan Thicke had a recurring role as another character from Robin's pop star past.
He played her father in a music video, and they worked together on a show called "Space Teens."
Regis Philbin joined the gang on their hunt for the perfect burger on season four.
He left his hosting gig on "Million Dollar Heads or Tails," to test the product.
Kendra Wilkinson starred as herself on the cover of a tabloid magazine.
Wilkinson, and several other reality stars, tried to talk Marshall through his struggles to go "number two."
Spencer Pratt and Heidi Montag — aka Speidi — taunted Marshall for his bathroom insecurities.
Luckily for Marshall, the problem didn't last too long.
Kim Kardashian managed to help Marshall get over his fear of using a public restroom.
Marshall admitted to not knowing why Kardashian was famous — a question many asked at the time.
"Orange Is the New Black" star Laura Prepon played Ted's snobby college girlfriend named Karen.
Lily and Marshall hated Karen's pretentious attitude.
"The O.C." star Rachel Bilson had a recurring role as Cindy, the roommate of Ted's future wife Tracy.
Cindy and Ted also dated, but it didn't last long.
Carrie Underwood guest-starred as Tiffany, who strung Ted along.
Tiffany was in a complicated relationship with another guy but asked Ted to "be patient" because she didn't want to lose him.
Jennifer Lopez guest-starred as an author named Anita on season five.
She made an appearance on "Come On, Get Up New York!" and helped Robin work through her relationship issues with Barney.
"13 Going on 30" star Judy Greer played Royce, one of the many women Ted dated.
Royce was a fan of "The Wedding Bride," which Ted did not care for.
"Once Upon a Time" star Jennifer Morrison had a recurring role as Zoey, Ted's enemy-turned-girlfriend.
She was an activist who often protested around New York City.
"Twin Peaks" star Kyle MacLachlan played George Van Smoot — aka The Captain.
The Captain was married to Zoey before she left him for Ted.
In 2011, Katy Perry played Zoey's friendly, yet "gullible" cousin.
Ted and his friends couldn't remember the name of Perry's character, so they referred to her as "Honey" when they later told the story of how they met.
"Project Runway" star Tim Gunn had a fitting role as Barney's personal tailor.
He showed up on short notice to help Barney with suit-related emergencies.
Maury Povich played himself in the episode "Subway Wars."
One of Marshall's coworkers confused Povich for Woody Allen.
Robbie Amell played Robin's dog-like boyfriend Nate Scooberman, who preferred the nickname Scooby.
Robin met him at a park, shortly after Ted denied her request to get a dog. Their relationship didn't last too long.
Will Forte made two appearances as Randy Wharmpess, a colleague of Barney and Marshall's.
Randy eventually quit his job to pursue his passion for brewing beers.
John Lithgow played Barney's father, Jerome Whittaker.
They were estranged for 30 years, but reconnected.
"Lost's" Jorge Garcia played Steve "The Blitz" Henry on a Thanksgiving-themed episode.
He met Ted and Marshall at Wesleyan University.
Nicole Scherzinger played Jessica Glitter, Robin's former BFF.
Glitter and Robin grew apart after she had a baby, but the two reunited years later thanks to Marshall and Lily.
"Jeopardy" star Alex Trebek guest-starred as a game show host, naturally.
He appeared on a show called "Million Dollar Heads or Tails," which Robin auditioned to be the "currency rotation specialist" for.
Actor Martin Short played a senior partner named Garrison Cootes at an environmental law firm called Honeywell and Cootes.
Cootes offered Marshall a position at the firm, but the latter was worried that he wouldn't pass the company's background check because of an old video of himself streaking.
"Harold and Kumar" star Kal Penn played good guy Kevin.
Kevin was Robin's therapist-turned-boyfriend. The two broke up over Robin's desire to not have kids.
Ted claimed that he gave Weird Al Yankovic the idea for "Like a Surgeon."
It was later confirmed in a flashback starring the singer.
Katie Holmes guest-starred as Naomi, a girl who Ted met at a Halloween party.
When Ted finally reconnected with her years later, he was disappointed to find out that they didn't have chemistry.
"Crazy Ex-Girlfriend" star Rachel Bloom had a cameo as a drunk passenger on a train on season seven.
She threw a drink in Ted's face when he approached her.
In 2013, "Full House" actor Dave Coulier guest-starred as himself.
He appeared on a documentary about Robin's former singing career.
Billy Zabka made several appearances as himself throughout the series.
While people who watch "The Karate Kid" love Ralph Macchio's character, Barney has a special place in his heart for Zabka.
"The Karate Kid" star Ralph Macchio showed up at Barney's bachelor party as himself.
This was part of an elaborate prank executed by Robin.
Keegan-Michael Key and Casey Wilson guest-starred as Calvin and Krirsten, a couple that Robin and Barney encountered while on a dinner date.
The two pairs became arch enemies, and Robin and Barney hatched a plan to try and break them up. It backfired and the couple ended up getting engaged.
"Hamilton" creator Lin-Manuel Miranda rapped his way through his role on season nine.
His character, Gus, encountered Marshall and baby Marvin while on a bus to Farhampton.
Tracey Ullman appeared as Robin's mother, Genevieve Scherbatsky, on the final season.
Robin was surprised that her mom made it to her wedding to Barney, considering that she was scared of flying.
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