All 45 Famous Guest Stars Who Have Had Cameos on Veronica Mars

In season one, the Gossip Girl actress plays Carrie Bishop, a classmate of Veronica's who accuses a teacher of having an affair with a student.

In season one's 14th episode, Adam Scott stars as the Neptune High teacher that Leighton Meester's character accuses of getting inappropriate with her and other students.

In season one, Aaron Paul plays Eddie "The Worm" LaRoche, aka a guy who films girls Girls Gone Wild-esque videos. So, basically this was the sketchy dude he played before moving on to Breaking Bad, in which he also played a sketchy dude.

Two-time Oscar nominee (The Help, Zero Dark Thirty) Jessica Chastain played Veronica's pregnant neighbor who goes missing in season one.

Socialite Paris Hilton appeared as Caitlin Ford, the brief girlfriend of Logan Echolls, in season one.

Before her Oscar for The Fighter, Melissa Leo played a transgendered woman, the parent of one of Veronica's classmates, in the first season.

Once a teacher, always a teacher. Glee's Jane Lynch played Mrs. Donaldson, a character with an affinity for air quotes in season one.

Michael Cera appeared in season two as a tour guide at Hearst College, which Veronica ends up attending.

Cera's Arrested Development costar Alia Shawkat also guest starred on the same season two episode. Her storyline was a little heavier: she's a victim of a serial rapist on campus. The suspect shaves her head after the heinous crime, and Veronica tries to figure out who did it.

Before breaking out on Glee, Dianna Agron appeared as Jenny, one of Veronica's criminology classmates at Hearst College in season three.

In season three's third episode, Armie Hammer plays a football player in danger of losing his scholarship thanks to a missing playbook, and recruits Veronica to track it down.

Jessica Jones actress Krysten Ritter plays Gia Goodman, the bubbly, ditzy daughter of Mayor Goodman. She reprised the role in the 2014 film, too.

Between Buffy the Vampire Slayer and How I Met Your Mother, Alyson Hannigan appeared as Logan's spoiled half-sister, Trina, in season one.

Boy Meets World star Rider Strong appears in a season three episode featuring a Stanford Prison Experiment-like test.

The Freaks and Geeks star pops up in the same season three episode as Rider Strong, only he's playing one of the "prisoners."

Before she moved onto the big screen with roles in Nick and Norah's Infinite Playlist and For a Good Time Call . . ., Ari Graynor starred as Jessie Doyle, the daughter of the man who was driving when the Neptune High bus crashes in season two.

Home Improvement's Zachery Ty Bryan appeared in two episodes in 2005 as Caz Truman.

Jonathan Taylor Thomas appears as Ben in season one, a morbid smart aleck who turns out to be an undercover ATF agent trying to track down a suspected bomber.

The Luke Cage star plays a weapons-obsessed classmate with a crush on Veronica in season one's 18th episode.

Joining Theo Rossi and Jonathan Taylor Thomas in the student bomber plotline in season one is True Blood's Michael McMillian, who plays a nerdy student who lives next door to Rossi's character.

Kevin Smith, director of movies such as Clerks, plays a convenience store clerk in season two who tries to callously capitalize on the bus crash. Smith is a huge fan of the show in real life, having declared it "hands-down, the best show on television right now, and proof that TV can be far better than cinema" back in 2005.

In seasons one and two, Amanda Seyfried plays Lilly Kane, whose murder kicks off the whole series. We get to see her in flashbacks here and there as Veronica uncovers the mystery of her death.

Ken Marino has a recurring role as Vinnie Van Lowe, Neptune's slimiest private eye. Marino returned both for the movie and Hulu's revived fourth season!

Harry Hamlin and real-life wife Lisa Rinna appear on the series in season one as Logan's parents, Aaron and Lynn. Hamlin also has a few appearances in season two, though things don't end well for him.

Jonathan Bennett, better known as Aaron Samuels from Mean Girls, appears in season one's ninth episode as Casey Grant, who Veronica is tasked with tracking down after he vows to hand over his $80 million inheritance to a cult.

The Good Wife's Matt Czuchry guest stars in season three as Logan's half-brother, but when Veronica catches wind of it, she exposes him as a lying Vanity Fair reporter.

Paul Rudd plays Desmond Fellows in season three, a washed-up rock star who comes to play on the Hearst campus, but ends up needing to be babysat by Piz and Veronica.

Aaron Ashmore plays Troy Vandergraf, one of Veronica's love interests and a former drug addict, in season one.

That's right, director Joss Whedon guest stars as Douglas, an employee of a rental car agency, in season two's sixth episode.

The High School Musical star plays the friend of Yolanda, a missing Neptune High student, in season one.

Before Black-ish, Anthony Anderson appeared in the first season of Veronica Mars as a famous rap producer whose missing daughter, Yolanda Hamilton, was an old friend of Veronica's.

Yep, even Valkyrie was in Veronica Mars! Thompson plays Jackie Cook in season two — the very spoiled daughter of a famous baseball player who takes a liking to Wallace. Although she initially clashes with Veronica, the pair become friends by the end of her character's run.

The Mayans MC star plays a Neptune High student who uses a fake ID to get drunk with his friend in season one. The problem? Said friend dies, and Pardo's character ends up in hot water and attempts to blame the situation on Veronica.

The British actor known for his role on The Nanny plays Budd Rose in season three, the distraught husband of his missing wife, Selma, a wealthy heiress.

In season three's second episode, the Twilight star pops up as a Hearst College sorority sister eager to recruit Veronica.

You can briefly spot Jamie Chung in season three as a drunk college student who has a sassy exchange with Wallace and Piz.

The Oscar winner has an extended arc in season four as Clyde Pickett, an ex-con who gets in deep with Neptune's sleaziest real estate tycoon, Big Dick Casablancas.

The actor, who costarred with Kristin Bell in When in Rome, has a blink-and-you'll-miss-it cameo in season four's second episode (during the scene from Dick's movie, Duhamel appears as a heroin dealer).

A.P. Bio's Patton Oswalt plays Penn Epner, a pizza delivery guy who gets caught up in the Neptune bombing case in season four.

Modern Family's Sarah Hyland is in season four's fourth episode for all of ten seconds, playing a girl in a club who gets hit on by Dick.

Yes, that's Greek's Clark Duke under that beanie and facial hair. The actor plays a member of Penn's cold case-solving group, the Murder Heads, in season four.