Whose Line Is It Anyway?

Lauren Cohan of "The Walking Dead" helps Ryan fight zombies and becomes props like a toboggan and a hang glider. Also joining the fun is Gary Anthony Williams.

Kevin McHale of "Glee" stops by for singing, dancing and catching popcorn in his mouth. Also, Heather Anne Campbell helps the boys do a James Bond scene on their backs.

Candice Accola of "The Vampire Diaries" dances with Wayne and becomes a prop for Ryan and Colin. Also, creepy dates creep everyone out, especially Colin and Keegan-Michael Key.

Kyle Richards of "The Real Housewives of Beverly Hills" throws down with Wayne and gets help from flight attendant Ryan. Jonathan Mangum goes through an undercover assignment.

"Whose Line" favorite Jeff Davis joins in an escape movie which ends up with Wayne getting naked. Olympic synchronized swimmers Mary Killman and Mariya Koroleva get a Duet.

Wilson Bethel of "Hart of Dixie" drops by to get a Duet from Wayne and Gary and do Three-Headed Broadway Star with Wayne and Ryan. Sideways Scene features out-of-shape cops.

A ditzy beautician waxes Colin's head, a "Girls Gone Wild" wannabe goes on a weird newscast and audience members "donate" their bags. WNBA legend Lisa Leslie gets a song.

Keegan-Michael Key returns to help Ryan make a taco ball and do some Bollywood dancing with Wayne and Colin. Wayne is a farmer's wife giving birth, and Colin plays with wigs.

Joining the fun is Laila Ali, who gets a new trainer in Ryan and also gets picked up (literally) by Colin. Also, Wayne and Jeff sing Songs of Acne.

Giggly Maggie Q of "Nikita" hugs and kisses Ryan and Wayne in Dubbing and endures Irishman Ryan in Helping Hands. Newcomer Nyima Funk introduces new superhero Gerbil Girl.

Two tight ends from the Legends Football League get a Duet from Wayne and Jonathan, and they help Ryan and Colin with their fire rescue scene. The boys do a Star Wars scene.

Olympic gold medalist Shawn Johnson becomes a shower, a tree and a geyser as newlyweds Ryan and Colin visit Yellowstone Park. Nyima Funk shows off her many disconcerting tattoos.