After a five-year absence, Sherry Stringfield returns to ER in the role of Dr. Susan Lewis -- the same week that series regular Erik Palladino makes his farewell appearance as Dr. Dave Malucci. In Chicago to interview for a job at another hospital, Lewis drops into County General to see her former "crush" Greene (Anthony Edwards) -- and is offered a position in County's ER when Weaver (Laura Innes) fires one employee and kicks another one "downstairs." Naturally, Lewis welcomes the chance to come home -- but what will Greene's current spouse, Elizabeth (Alex Kingston), think? ~ Hal Erickson, Rovi