Ever since the cult zombie classic Shaun of the Dead hit theaters exactly 10 years ago, many fans have been clamoring for a sequel. While that won't be happening anytime soon, Simon Pegg announced today on his Twitter page that he will reprise his role as Shaun, with Nick Frost returning as Ed for Phineas and Ferb's Halloween special on the Disney Channel this October.Here’s news, @nickjfrost and myself will be once again stepping into Shaun and Ed’s shoes for the #PhineasAndFerb Halloween special.