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Get a first look at images from Glee's Halloween episode

1 of 5 Adam Rose/Fox


Finn's look started out "pretty bland, like the nerdy character Brad is," says costume designer Lou Eyrich. But once Cory Monteith put on the black-rimmed glasses and got a side part in his hair, he transformed. "Cory's just a big goofy nerd and so is Brad," says Colfer. "He was perfect."
2 of 5 Adam Rose/Fox


When Puck drops out of the production, John Stamos' Dr. Carl fills in — crashing his motorcycle through a stage wall. Since it's difficult to imagine hunky John mimicking a role played in the film by Meat Loaf, Carl does "his own sexy version of Eddie to intimidate Will [Matthew Morrison]," says Eyrich. "It was actually John's idea to do a take-off on Elvis' leather-suit look from his 1968 TV special."
3 of 5 Adam Rose/Fox


"Here, Quinn [Dianna Agron] is one of the partygoers for our big 'Time Warp' dance scene," says Eyrich. "When the hairstylists told us they wanted to give Dianna a pink wig, we gave her a pink top and glittery hat. To make it more youthful, we used a high-waisted pant from H&M and a gold cummerbund." Quinn does double duty in the production, joining Santana (Naya Rivera) as dual versions of kinky-wigged domestic Magenta.
4 of 5 Adam Rose/Fox


"At first, Sam [Chord Overstreet] is wearing tiny little gold shorts, but then they decide that's maybe not appropriate for a school play, so he ends up in these gold board shorts and tank top," explains Eyrich. Overstreet was shocked when he saw what little he'd be wearing. "He was a really good sport but hit the gym extra hard," adds Eyrich. But Colfer has no sympathy: "Ha! Take that, new guy!" Glee Rocky Horror Picture Show
5 of 5 Adam Rose/Fox


"Riff Raff is the best character, and everyone was amazed at how incredible the makeup was," says Colfer. "I was mistaken for a blonde woman a couple times. All I kept thinking was, 'You did this to yourself, Chris.'"