'Veronica Mars': Jessica Chastain and 14 Other Surprisingly Famous Guest Stars

In her college years, Veronica got a few high profile visitors, including Rudd's Desmond Fellowes, a washed up '90s singer put under Piz's direction for his San Diego concert. He lost his own tapes and hit on Veronica, but in the end everything actually turned out alright. It's Paul Rudd, you knew this was going to end well/

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Before he was selling meth on Breaking Bad, Paul was seedy Eddie "The Worm" LaRoche, the young man responsible for San Diego's contributions to Girls Gone Wild... in the Veronica Mars universe anyway.

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The sweet-faced Glee star was a student in Veronica's criminology class who took her learning to a darker place, framing Weevil for the fake ID racket she and her ski-lodging friends were running.

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He may be a sweet, caring (spoiler!) husband to Leslie Knope on Parks and Recreation, but he was once Veronica's favorite teacher... and the man sleeping with one of his students.

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Amanda Seyfried appeared a few times on the show in flashback scenes as Veronica's murdered best friend Lily Kane. For the first two seasons, it was this tragedy that drove Veronica to find the truth in every case.

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While it eventually turned out that Trina Echolls had reason for her misguided ways, Hannigan's character started as giant thorn in the side of Veronica's flame, Logan Echolls.

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Before she was terrorizing the Glee club, Lynch played a perfectly normal student administrator on Veronica Mars.

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As Carrie Bishop, Meester accused Veronica's favorite teacher (played by Adam Scott) of having an affair with her. It turned out, Mr. Rooker was having an affair, just with Carrie's pregnant best friend.

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Office Leo D'Amato may have been a little ditzy from time to time, but he was sweet enough to win Veronica's romantic favor... up until the point she realized she was in love with Logan Echolls. Poor Max.

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Hamlin was the villain of the first season. He was revealed to be an abusive father to Logan and the true murderer of Veronica's best friend Lily Kane. He also tried to kill Veronica at one point. Swell guy, really.

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Well, not so much a B as someone who, on occasion, spoke a little too freely. Ritter's Gia was the daughter of an influential pro baseball team holder and later, someone Veronica managed to save from a stalker.

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No, that's it. She just played the mom to Troy, a guy Veronica briefly dated while he attempted to use her to help him get away with his drug-smuggling business.

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He played the owner of the San Diego Sharks (a TV answer to the San Diego Padres) and served as the first line of proof that Rob Thomas loves Steve Guttenberg. (He later guested on Thomas' Party Down as himself.

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Bryan made it out of the 9-0s and into the 0-9ers (the rich kids in the Veronica Mars universe). He played Caz, a basketball player so dumb, "he'd flirt with a trash can if it had boobs." But hey, at least he's not living in a house that his dad is constantly not improving at all. Grunt, grunt, grunt.

[CREDIT: Warner Bros. Television]