1. Michelle Obama in "iMeet the First Lady"
The former first lady starred as herself and made a special appearance in an iCarly webcast after being invited by Carly, Sam, and Freddie.
2. Emma Stone in "iFind Spencer Friends"
Emma, who stars as Cruella de Vil in the upcoming Cruella film, played mega fan Heather, who was ~just a tad~ too excited about running into the iCarly crew at a restaurant.
3. Jimmy Fallon in "iShock America"
During this episode, the late-night host starred as himself and invited the iCarly team to appear on The Tonight Show.
4. Tina Fey in "iShock America"
Tina had a brief cameo in the same episode as Jimmy, helping him turn off his camera after his video call with Carly, Sam, Freddie, and Gibby.
5. Jordan Fisher in "iSpeed Date"
Jordan (yes, John Ambrose himself!!!) played Clark, one of the boys Carly met during her speed-dating contest to find a date for the dance.
6. Jane Lynch in "iSam’s Mom"
Jane played Pam Puckett — aka Sam's mom — and of course, the mother-daughter duo had a ton of drama the entire episode.
7. Austin Butler in "iLike Jake"
Austin played Carly's crush Jake, who was invited to sing on iCarly — but turned out to be, well, ~not~ the greatest singer.
8. Emily Ratajkowski in "iSpeed Date" and "iEnrage Gibby"
Yup! The supermodel herself played Gibby's girlfriend, Tasha.
9. Jim Parsons in "iLost My Mind"
Jim, aka Sheldon from The Big Bang Theory, made an appearance as a man named Caleb, who believed he was from the future.
10. Chord Overstreet in "iSpeed Date"
The Glee star appeared in the same episode as Jordan Fisher, playing a speed-date contestant named Eric, a model turned lead singer in a boy band — whom Freddie was instantly jealous of.
11. Jack Black in "iStart a Fan War"
In this episode, the iCarly crew attended Webicon, and Jack Black guest-starred as Aspartamay, Spencer's rival in World of Warlords (a parody of World of Warcraft).
12. Victoria Justice in "iFight Shelby Marx"
Victoria played MMA fighter Shelby Marx, whom Carly infamously invited to fight during a web show — and then Shelby actually agreed to it.
13. Randall Park in "iGot Detention"
Randall — aka FBI Agent Jimmy Woo on WandaVision — played a teacher named Mr. Palladino as the iCarly trio attempted to film their 50th web show with Sam in detention.
14. David Archuleta in "iRocked the Vote"
The former American Idol contestant played a contestant on America Sings, Nickelodeon's version of the popular singing competition.
15. Taran Killam in "iMeet the First Lady"
The Saturday Night Live comedian starred in the same episode as Michelle Obama, playing one of her Secret Service agents.
16. Harry Shum Jr. in "iGo to Japan"
Harry — Mike Chang on Glee — played Yuki, an internet star who tried to stop Carly, Sam, and Freddie from winning the iWeb Awards.
17. Kenan Thompson in "iParty With Victorious"
The SNL comedian and Kenan & Kel star played himself in this crossover episode that also starred Victoria Justice from Victorious.
18. Lucas Cruikshank in "iMeet Fred"
Lucas — known for his viral internet personality, Fred Figglehorn — guest-starred as himself and Fred, who made a special appearance in an iCarly webcast.
19. Last: One Direction in "iGo One Direction"
The original 1D band (Zayn Malik, Harry Styles, Liam Payne, Niall Horan, and Louis Tomlinson) made an appearance in this iconic episode and even performed "What Makes You Beautiful" on the iCarly stage.
