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“The Office” is quite possibly one of the most iconic television shows of all time. There’s no shortage of memes, parodies, and quotable moments, but the sheer star-power in the series is a category all its own.

Principal cast aside, some big Hollywood celebs made some hilarious, heartfelt, and flat-out weird guest appearances over the show’s eight-year run. But with a whopping 188 episodes and nine seasons, it’s entirely possible that even the most dedicated Dunder Mifflin fanatics may have forgotten who played who (and we wouldn’t judge you for it).

Keep scrolling for a refresher on all the celebrities that guest starred in “The Office.”

Ricky Gervais played his iconic character on the show during season seven.

Ricky Gervais played his iconic character on the show during season seven.
He’s the UK version’s co-creator.
Netflix

Some may be surprised to learn that the “The Office” we all binge on Netflix actually isn’t the first version of the show. The series originated in the UK with show co-creator Ricky Gervais starring as David Brent, a.k.a the British version of Michael Scott. Gervais reprised his role twice in season seven of the US version: once in a cold open where he befriend Michael outside an elevator, and a second as an applicant to Dunder Mifflin.

Warren Buffett made a sly guest appearance during season seven.

Warren Buffett made a sly guest appearance during season seven.
He was briefly interviewed for a job.
Netflix

No one would blame you if you didn’t catch this one. Remember the man who tried to penny-pinch Dunder Mifflin during his job interview in season seven? Yeah, it was Warren Buffett, no big deal.

Idris Elba played a tough higher-up during season five.

Idris Elba played a tough higher-up during season five.
He was the killjoy higher up.
Netflix

Michael Scott definitely had a penchant for befriending the DM corporate higher ups, but Idris Elba’s Charles Miner proved to be a bit of a killjoy throughout season five with his stickler management style.

Will Ferrell popped up a few times in season seven.

Will Ferrell popped up a few times in season seven.
He had tough shoes to fill.
The Office / NBC

Ferrell and Steve Carell have been friends for years and previously starred in “Anchorman: The Legend of Ron Burgandy” together, so it’s no surprise he popped up in a few episodes as Deangelo Vickers, the Southwest-obsessed replacement for Michael Scott. He lasted just four episodes before making a not-so-graceful exit after injuring himself in a freak basketball accident.

Amy Adams played Jim’s ex in season one.

Amy Adams played Jim's ex in season one.
She was on for three episodes.
Netflix

Before Jim and Pam were, well, Jim and Pam, there was Jim and Katy. That’s right — before Adams became the Hollywood starlet we know today from hits like “Sunshine Cleaning,” “Doubt,” and “Julie and Julia,” she played Jim’s overly-perky, ex-cheerleader girlfriend for three episodes before he dumped her on a booze cruise.

James Spader had a recurring role in seasons seven and eight.

James Spader had a recurring role in seasons seven and eight.
He made a few appearances.
The Office / NBC

Ah, who could forget the mysterious and weirdly enchanting Robert California? James Spader starred as the CEO of Sabre before leaving to star in “Avengers: Age of Ultron” and “The Blacklist.”

Kathy Bates also appeared in seasons seven and eight.

Kathy Bates also appeared in seasons seven and eight.
She often communicated via video call on the show.
Netflix

Before Robert California talked his way into the Dunder Mifflin offices, Kathy Bates played the overly-confident and deeply-Southern Jo Bennett, Sabre’s original founder and CEO.

Evan Peters played Micheal’s nephew in season seven.

Evan Peters played Micheal's nephew in season seven.
He played a pretty annoying character.
Netflix

Before Evan Peters was freaking out all of America in “American Horror Story,” he had a brief cameo in the season seven episode “Nepotism,” in which he starred as Michael Scott’s nephew Luke Cooper. In the end, baby Evan left the episode in tears after Michael literally spanked him for basically being a terrible employee. Awkward.

Will Arnett also played someone who came in for an interview in season seven.

Will Arnett also played someone who came in for an interview in season seven.
He was toward the beginning of the episode.
Netflix

Arnett’s guest appearance was brief but memorable in season seven’s “Search Committee” episode, where he played a secretive manager candidate that insisted on withholding a precious three-step plan from Jim, Toby, and Gabe.

Jim Carrey also guest-starred during season seven.

Jim Carrey also guest-starred during season seven.
He was certainly memorable.
IMDb

Another of several guest appearances in the Search Committee episode was Jim Carrey’s quirky character, simply known as Finger Lakes Guy. That name alone should jog your memory.

Christian Slater appeared in a strange orientation video in season six.

Christian Slater appeared in a strange orientation video in season six.
He was in an orientation video the employees watched.
Netflix

Technically this could be considered a not-so-subtle cameo, but we can’t just ignoreChristian Slater in Sabre’s mildly creepy orientation video.

Rashida Jones appeared in season three as a love interest.

Rashida Jones appeared in season three as a love interest.
Before Pam there was Karen.
Netflix

Before she took on the role of the poetic and beautiful land mermaid Ann Perkins on “Parks and Recreation,” Jones was Karen Filippelli, Jim Halpert’s last girlfriend before he finally confessed his love for Pam.

Timothy Olyphant was mean to Pam in season seven.

Timothy Olyphant was mean to Pam in season seven.
He rubbed a some fans the wrong way.
Netflix

“The Santa Clarita Diet” star appeared as rival salesman/possible male model (in Michael Scott’s words) Danny Cordray for a few episodes in season seven. But while he was nice to look at, he left the show in poor taste when it was revealed he thought Pam was too dorky to date. #Rude.

Kevin McHale had a memorable role, even as a pizza delivery man in season four.

Kevin McHale had a memorable role, even as a pizza delivery man in season four.
He played a hostage.
Netflix

Before he landed his most well-known role as the nerdy yet ridiculously-talented Artie Abrams on “Glee,” McHale was a pizza delivery man with an attitude that landed him as Michael and Dwight’s Hostage during the company launch party.

Tim Meadows serenaded us in season two.

Tim Meadows serenaded us in season two.
His dinner with Jan and Michael was iconic.
Netflix

You may know him as Mr. Duvall in “Mean Girls,” but we can’t forget Meadows’ business meeting with Michael and Jan at America’s (unofficial) Favorite Restaurant: Chili’s. Remember them singing their all-too-catchy jingle about baby back ribs?

Jack Black and Jessica Alba had a really random appearance in season five.

Jack Black and Jessica Alba had a really random appearance in season five.
It was pretty unexpected.
Netflix

Technically this could be considered the most random cameo in the world rather than a true guest appearance. Black and Alba made a small appearance in as an on-screen couple in a fictional film that Andy bootlegged in season five’s Stress Relief episode. The two actors didn’t interact with any of the show’s characters, but it still deserves some credit.

Melissa Rauch played a fellow new mom in season six.

Melissa Rauch played a fellow new mom in season six.
She played a new mother.
Netflix

Around the same time she started her role as Bernadette Rostenkowski on “The Big Bang Theory,” Rauch guest starred as new mom Cathy in Delivery: Part 2, where Pam accidentally breastfed Cathy’s baby in an exhausted stupor instead of little Cece — a common mistake, obviously.

Ray Romano also played an interviewee in season seven.

Ray Romano also played an interviewee in season seven.
He even took out a sandwich during his job interview.
Netflix

The comedian and star of “Everybody Loves Raymond” joined the handful of celebs that made an appearance in the Search Committee episode. Romano played Merv Bronte, the easily-influenced and self-deprecating interviewee.

Josh Groban played Andy’s brother and appeared in seasons eight and nine.

Josh Groban played Andy's brother and appeared in seasons eight and nine.
He was Andy Bernard’s brother.
Netflix

In what is probably one of the more random guest stars on the show, Groban played Andy Bernard’s more talented, adorably unaware younger brother Walter Bernard Jr. You might remember him from the Garden Party episode when he upstaged Andy and mistook both Phyllis and Meredith for Pam.

Joan Cusack had a rare and sweet cameo in season nine.

Joan Cusack had a rare and sweet cameo in season nine.
She was in the final episode.
Netflix

Cusack had a small but significant role in the Finale episode as Erin Hannon’s biological mother. While she didn’t have more than a couple lines, her sweet role was the perfect touch on what was arguably one of the most emotional episodes in the series.

(C)