TV Guide is reporting that the cast of Smallville will be heading to the Metropolis version of Las Vegas in the February 25th episode to celebrate Lois and Clark's engagement. However, the weekend becomes one big blur after a wild bachelor/bachelorette party.

"It's our fun 'Hangover' episode," says executive producer Brian Peterson. "Clark won't remember what happened the night before." With Supes impervious to the effects of alcohol, it's a spiked bottle of champagne sent by Zatanna that sparks the insanity. "You see the wild side of everybody," adds exec producer Kelly Souders, who hints at a big surprise moment involving Tess and Dr. Emil.

"We all wake up in different places in bizarre situations involving weird outfits and animals," says Erica Durance. "I wake up out on the train tracks with Oliver and realize I can't find my engagement ring."

The episode will also feature another appearance by Allison Mack as Chloe and the introduction of Amos Fortune - a DC Comics supervillain first introduced in 1961.