25 Famous Actors You Didn't Know Were On Veronica Mars

Before they were famous, they were marshmallows.

1. Lucas Grabeel

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In season 2 Lucas Grabeel played Kelly Kuzio.

But you probably know him as...

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Sharpay's super talented brother, Ryan Evans from High School Musical!

2. Kristen Cavallari

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In season 2 Kristen played Kylie Marker.

But you probably know her from...

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Laguna Beach and then again in later seasons of The Hills.

3. Michael Cera

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Veronica meets Michael Cera's character, Dean, while visiting Hearst College.

But you probably know him from...

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Juno. Superbad. Scott Pilgrim. Pick your poison.

4. Keri Lynn Pratt

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Pratt played sorority girl Hallie Piat.

But you may know her from...

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Pratt starred in the straight to video movie, Cruel Intentions 2. She also played Dee Vine in Drive Me Crazy and had a recurring role on Smallville.

5. Leighton Meester

Leighton played Carrie in season 1.

But you definitely know her as...

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Blair from Gossip Girl. She also just became Mrs. Adam Brody.

6. Dianna Agron

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Agron appeared in season 3 as Jenny, one of Veronica's college classmates

But you know her as...

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Quinn Fabray from Glee.

7. Sam Huntington

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Sam played Luke in season 1.

But you may know him from...

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Being Human on the SyFy network. You will also see him reprise his role in the Veronica Mars movie! Of course we can't forget Huntington as Mimi-Siku in Jungle2Jungle.

8. Alyson Hannigan

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Hannigan plays Logan's sister, Trina.

But you know her from...

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We may have met her in American Pie but she stayed in our hearts with her roles in Buffy and How I Met Your Mother.

9. Lisa Rinna

Rinna played Logan's mom, Lynn Echolls.

But you may know her from...

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Her many years on Days of Our Lives and Melrose Place.

10. Aaron Ashmore

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Ashmore played Veronica's ex-boyfriend, Troy.

But you may know him as...

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Jimmy Olsen on Smallville.

11. Steve Guttenberg

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Guttenberg plays Mayor Woody.

But you may know him from...

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Police Academy. He was also Mary Kate and Ashley's dad in the movie It Takes Two!

12. Patrick Fabian

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Fabian played Professor Hank Landry.

But you may remember him as...

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A different professor who put the moves on Kelly Kapowski. Fabian played Professor Lasky on Saved by the Bell: The College Years (among many other roles on TV).

13. Krysten Ritter

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Ritter plays Gia Goodman, Veronica's classmate.

But you may know her from...

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Don't Trust the B in Apt 23. Breaking Bad. Gilmore Girls. Ritter will also reprise her role as Gia in the Veronica Mars movie.

14. Max Greenfield

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Greenfield plays Officer Leo.

But you probably know him from...

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New Girl. #schmidthappens

15. Amanda Seyfried

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Seyfried (sort of) starred in season 1 as Lilly Kane, Veronica's dead BFF.

But you probably know her from...

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Mean Girls. And frankly, countless other movies since now she's kind of a big movie star.

16. Jessica Chastain

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Chastain plays Veronica's neighbor, Sarah, in an episode of season 1.

But you probably know her from...

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This chick is now an Oscar nominated actress and you have most likely seen her in both The Help and Zero Dark Thirty.

17. Adam Scott

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Scott plays Veronica favorite teacher in season 1 who gets caught up in some shady business.

But you probably know him from...

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Parks and Rec. And a scene stealing song in Step Brothers which you can view here.

18. Melissa Leo

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Leo played John Julia Smith, a transgender woman.

You know her from...

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Her Academy Award winning role in The Fighter.

19. Jane Lynch

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Lynch was a school administrator on the show.

But you know her as...

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Sue Sylvester from Glee.

20. Ari Graynor

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She played Jessie Doyle in season 2.

You may know her from...

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Nick and Norah's Infinite Playlist. For A Good Time, Call... You may have even seen her in the short-lived TV adaptation of Bad Teacher.

21. Armie Hammer

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Hammer appeared in season 3.

But we saw him (in double) as...

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The Winklevoss twins in The Social Network. He also played Leo DiCaprio's love interest in J. Edgar and the Prince in Mirror Mirror.

22. Paul Rudd

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When Veronica is in college, Rudd plays Desmond Fellowes, a big-time (and kind of washed up) musician.

I'm sure you know him as...

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A super famous movie star. Clueless. Anchorman. Knocked Up. The list goes on and on and on.

23. Aaron Paul

Paul played Eddie "The Worm" LaRoche.

But we only see him as...

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Jesse from Breaking Bad. #yeahbitch

24. Zachary Ty Bryan

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He played Caz the basketball star.

But we know him as...

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Tim Allen's oldest son on Home Improvement.

25. Kevin Smith

Smith plays a convenience store clerk... get it?

But clearly he is...

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Silent Bob. Forever.