We started paying attention to Lizzy Caplan when she played the rebellious and witty Janice Ian in 'Mean Girls' and the doomed Marlena in 'Cloverfield,' and she's been on our radar with her edgy roles ever since. In today's Way Back When, we take a look at some of her lesser-known performances.

'Freaks and Geeks'

Lizzy Caplan played disco-loving Sara in a few episodes of the tragically short-lived Paul Feig series 'Freaks and Geeks.' When she hooks up with Jason Segel's Nick, she inspires him to quit smoking pot and try his hand (or foot) at a disco dancing contest at the local bowling alley. You can watch Segel's awesome dance moves and a too-cute Caplan in the clip below:

'Everybody's Doing It'

In 2002, Caplan starred in the MTV movie 'Everybody's Doing It' based on the rise of abstinence-only programs in high schools, where kids are taught that abstaining is the only way to have safe sex, and condoms are only discussed in terms of failure rates. Based on real education programs, the movie takes a humorous look at what happens when Angela (Caplan) wants to have sex with her boyfriend, but is horrified by all the information she learns through her school's abstinence education. Basically, here we have a movie in which the entire driving force is whether or not Lizzy Caplan will have sex.

'Smallville'

Caplan starred in two episodes of 'Smallville,' the WB's Superman origin series, as Tina Greer. In the trailer for the episode titled "X-Ray," you can see a couple of glimpses of Caplan, who gets kind of weird and totally is not herself -- mainly, Michael Rosenbaum's Lex Luthor morphs from bald creeper to adorable, big-eyed Caplan, and it may make you question your sexuality or something:

'The Pitts'

Judging by these opening credits, we can see why 'The Pitts' wasn't meant to last on television for very long. Caplan starred alongside Dylan Baker in this 2003 TV series about a family who has the worst luck ever and goes on a bunch of wacky adventures -- and dinosaurs? Dinosaurs, sure.

'Tru Calling'

Caplan followed her role in 2004's 'Mean Girls' with a string of appearances on the series 'Tru Calling,' starring Eliza Dushku as a college grad working in a city morgue, who is given some 'Groundhog Day' powers and allowed to repeat the same day over and over again to solve mysteries. The series also starred Zach Galifianakis, and the episode featured in the clip below also stars Eric Christian Olsen of 'Dumb and Dumberer' and 'Community.'

'Love is the Drug'

In 2006, Caplan starred in 'Love is the Drug,' an indie flick about a love triangle that forms among a group of friends and recent high school graduates -- but there's a twist: the love triangle becomes a triangle of death! Or something like that. Anyway, enjoy Caplan doing a karaoke rendition of "Do It to Me One More Time":

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