Kristen Bell (Zoe)
Okay, okay, okay, so it's not exactly a cameo -- she's actually the fifth member of the group for most of the film -- but we just wanted to emphasize that Kristen Bell is in this. She's gonna turn her confident blonde image (as seen on Heroes and in Forgetting Sarah Marshall) on its ear playing a comic shop employee who's comfortable with her body, and she'll keep you hanging around until the last five minutes, when she dons a stainless steel bikini a la Princess Leia. Hotcha!

David Denman (Chaz) and Christopher McDonald (Big Chuck)
You may not recognize the names, but you'll recognize the faces -- Denman is better known as Roy, Pam's jealous ex-fiancé on The Office. As the older, car-salesman brother of Sam Huntington's character Eric, he's constantly harassing Eric's friends by giving them Star Wars-themed (but still insulting) nicknames. And McDonald has been a familiar face around Hollywood for three decades, although his most famous role was arguably golfer Shooter McGavin in Happy Gilmore. He plays Chaz and Eric's dad, the owner of a chain of car dealerships who wants Eric to take over the business, and at one point is not-so-subtly dressed as Darth Vader.

Seth Rogen (Admiral Seasholtz/Star Trek Alien/Roach the Pimp)
Rogen is the comedic workhorse of the film, appearing in three very different roles, two of which render him nearly unrecognizable. As buck-toothed, Han Solo-hating Trekker Admiral Seasholtz, his crew engages in more than one rumble with the Star Wars-loving protagonists. Rogen returns later as Roach, a Han-Solo-loving pimp with Star Wars tattoos on both arms, and look closely to catch him as a heavily made-up alien security guard at a Star Trek convention. Rogen must have really wanted to be in this movie.

Danny Trejo (The Chief)
To try to describe Trejo's character, who bails out our heroes when they get into a jam, would not be doing him justice. In fact, we're pretty sure they just put Trejo (Once Upon a Time in Mexico) on screen and let him do what came naturally, namely wearing a tracksuit, playing a drum and eating some peyote.

Ethan Suplee (Harry Knowles)
I'm not entirely sure why they didn't get Ain't-It-Cool-News founder Harry Knowles to play himself, but it may be because this is a fictionalized Knowles, who kicks the ass of all of the main characters when he shows up on screen. Something tells us Knowles would need a stunt man for that. Or two stunt men. Suplee (My Name is Earl) does an admirable job, taking out all four guys before quizzing them on Star Wars to prove their geekitude. He's like the Sphinx!

Billy Dee Williams (Judge Reinhold), Carrie Fisher (Doctor) and Ray Park (Security Guard)
These three Star Wars cast members -- better known as Lando Calrissian, Princess Leia and Darth Maul -- appear at different points in the film, in tributes to their sci-fi roles. Fisher plays a doctor who is their cancer-stricken friend's "only hope," while Park is a security guard at Skywalker Ranch who wields twin batons. And Williams... Williams is the coolest judge with the name of a 1980s film actor to ever grace the bench.

Kevin Smith & Jason Mewes (themselves)
If there's a bigger self-avowed Star Wars geek in Hollywood than Smith, we don't know who it is. Originally in the running to play the Knowles role, Smith instead turns up with his partner-in-crime Mewes at a gas station bathroom, where Smith is apparently renting out Mewes to truckers. This may be documentary footage.

William Shatner (himself)
The Star Trek icon makes an appearance as the gang's informant, who is instrumental in their plan to infiltrate Skywalker Ranch. Perhaps it's an attempt to bring down a rival franchise? Although, at this point, I think he sees Star Trek as a rival franchise.

Will Forte and Craig Robinson (Security Guards)
The SNL star and Darryl from The Office make an appearance as security guards caught in a hilarious Mexican standoff in George Lucas' office. You can actually see the entire clip here, in which Forte reveals that he's more of a Star Trek fan, and Kristen Bell threatens to torch an Ewok head. (Note that all of the guards are dressed like policemen from THX-1138.)

Danny McBride (Head of Security)
In the film's only completely uncredited cameo -- which is strange, given how rapid his rise to fame has been, and how sizable his cameo is -- McBride turns up as head of Skywalker Ranch security. We won't get too into what goes on in his scenes, which are fairly close to the end of the movie, but we will say that he seems to be an expert on obscure sexual maneuvers. Yeah, we weren't expecting it either.