At ABC, David Arquette (Scream) has joined the comedy In Case of Emergency, playing a businessman who botches a suicide attempt.... Peter Facinelli (Six Feet Under) has landed the second lead (opposite Jeffrey Donovan) in Enemies.... Sarah Clarke (24) has joined the drama A House Divided.... Charlotte Ross (Jake in Progress NYPD Blue) has come aboard Ugly Betty.... and Sean Patrick Flannery (The Dead Zone) has joined Secrets of a Small Town. Elsewhere, Doublemint Twin Natalie Garza has been cast on Fox's The 12th Man, Michael Gaston has joined CBS' Jericho, and Lenny Clarke will play Rob Corddry's pop in Fox's Becoming Glen.