27 Actors You Probably Didn't Realise Were Guest Stars On Your Fave Shows

1. Zac Efron — Firefly

1. Zac Efron — Firefly

"Zac Efron as the young Simon in Firefly."

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2. Dylan Minnette — Grey's Anatomy

2. Dylan Minnette — Grey's Anatomy

"Dylan Minnette (Clay from 13 Reasons Why) was in Grey's Anatomy."

3. Jennifer Lawrence — Monk

3. Jennifer Lawrence — Monk

"I was watching old Monk reruns and someone in a lion mascot costume walks into the locker room and takes off the head, only to reveal Jennifer Lawrence is underneath! She's even referred to as Jen!"

4. Chris Hemsworth — The Saddle Club

4. Chris Hemsworth — The Saddle Club

5. Zooey Deschanel — Frasier

5. Zooey Deschanel — Frasier

"Zooey Deschanel as Roz's snarky and hipster cousin on Frasier! Not only is a blonde Deschanel bizarre, her too-cool-for-school attitude couldn't be more different from Jessica Day."

6. Aaron Paul and Jane Lynch — The X-Files

6. Aaron Paul and Jane Lynch — The X-Files

"Playing (respectively, in the same episode) a high school stoner and a high school principal.
AMAZING."

7. Andrew Garfield — Doctor Who

7. Andrew Garfield — Doctor Who

"Andrew Garfield in Doctor Who.
I rewatched that episode one day and was like holy shit...
that's him."

8. Steven Yeun — The Big Bang Theory

8. Steven Yeun — The Big Bang Theory

"Steven Yeun aka Glenn from The Walking Dead on The Big Bang Theory as Sheldon's old roommate."

9. Millie Bobby Brown — NCIS

9. Millie Bobby Brown — NCIS

"Millie Bobby Brown (Stranger Things) played a sociopath who killed her mother on NCIS."

10. Emma Stone — Malcolm in the Middle

10. Emma Stone — Malcolm in the Middle

"Blew my mind seeing Emma Stone in an episode of Malcolm in the Middle."

11. Ryan Gosling — Goosebumps

11. Ryan Gosling — Goosebumps

"Ryan Gosling on Goosebumps! 'Say Cheese and Die'!"

12. Joe Manganiello — One Tree Hill

12. Joe Manganiello — One Tree Hill

"Whenever anyone starts talking about Joe Manganiello being on True Blood or Magic Mike, I like to remind them that we had him first as Owen on One Tree Hill."

13. Gabriel Macht — Beverly Hills 90210

13. Gabriel Macht — Beverly Hills 90210

"Seeing Gabriel Macht from Suits on Beverly Hills 90210 was probably the most cool yet WTF moment of my entire life!"

14. Rami Malek (from Mr Robot) — Gilmore Girls

14. Rami Malek (from Mr Robot) — Gilmore Girls

15. Ethan Suplee and Adam Scott — Boy Meets World

15. Ethan Suplee and Adam Scott — Boy Meets World

"Adam Scott as Griffin Hawkins and Ethan Suplee as Frankie Stechino, Cory's bullies, in Boy Meets World."

16. Courteney Cox — Murder She Wrote

16. Courteney Cox — Murder She Wrote

"Courteney Cox in Murder, She Wrote! Makes me laugh every time I see her."

17. Zach Braff — The Baby-Sitters Club

17. Zach Braff — The Baby-Sitters Club

Zach Braff in 'Dawn Saves the Trees'."

18. Max Greenfield — The OC

18. Max Greenfield — The OC

"He was young Sandy Cohen on The OC!"

19. Matthew McConaughey — Unsolved Mysteries

19. Matthew McConaughey — Unsolved Mysteries

"I was very surprised to find out Matthew McConaughy was in an episode of Unsolved Mysteries.
I had to go back and rewatch the episode (it's on the DVD set).
It's so weird to see, yet he does a great job in such a sad story.
I remembered the story, but when I first saw it I clearly had no idea that he would become such a famous renowned actor."

20. Shia LaBeouf — Freaks and Geeks

20. Shia LaBeouf — Freaks and Geeks

"Honestly, I was surprised by everybody who appeared on Freaks and Geeks but seeing little Shia LaBeouf as the injured mascot will always surprise me.
Still so cute and so hilariously Shia even all the years ago."

21. Amy Adams — Charmed

21. Amy Adams — Charmed

"Watching old episodes of Charmed and Amy Adams pops up playing a good samaritan who is tapped by a 'dark lighter' demon that makes her so unlucky she wants to jump off a building.
Thankfully she is saved by the Power of Three and lives to become an Oscar-nominated actor.
Phew!"

22. Nick Offerman — The West Wing

22. Nick Offerman — The West Wing

"Nick Offerman (Ron Swanson) had a cameo in The West Wing long before Parks and Recreation! He played Jerry (yes Jerry!) in the Season 1 episode 'The Crackpots and These Women'."

23. Mila Kunis — 7th Heaven

23. Mila Kunis — 7th Heaven

"Mila Kunis on 7th Heaven as Lucy's frenemy Ashley, before she was on That '70s Show."

24. Jeremy Piven — Seinfeld

24. Jeremy Piven — Seinfeld

"Jeremy Piven from Entourage auditioning and getting the role of George in the pilot of 'Jerry' in Seinfeld."

25. Lin Manuel Miranda — How I Met Your Mother

25. Lin Manuel Miranda — How I Met Your Mother

26. George Clooney — The Golden Girls

26. George Clooney — The Golden Girls

"George Clooney played a cop on The Golden Girls."

27. Evan Peters — The Office

27. Evan Peters — The Office

"Evan Peters as Michael Scott's nephew in The Office.
I couldn't stop laughing when he got spanked in front of the entire staff."

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