Shaun of the Dead's Shaun (Simon Pegg) and Ed (Nick Frost) return in an animated form with the first clip from Phineas and Ferb's Halloween special, entitled "Night of the Living Pharmacists", airing Saturday, October 4 at 8 PM ET during Disney Channel's Monstober block of programming.

We repoted in August that Simon Pegg and Nick Frost will voice their characters from the 2004 zombie comedy, but little was known about the story at that time. This episode centers on a new device created by Heinz Doofenshmirtz (Dan Povenmire), which accidentally turn everyone in Danville into "Doof-zombies" who run rampant all over town. While traditional zombies have to bite their victims, Doofenshmirtz's machine allows the transformation to be much easier.

Take a look at the first scene from this weekend's episode, which also features guest stars such as Night of the Living Dead director George A. Romero as reporter Don Adaded, along with Noah Wyle and Bella Thorne, and returning actors Ariel Winter (Fireside Girl) and Cloris Leachman (Mrs. Feyersied).