Season 5, Episode 12
As Annie plans a mysterious day of cleaning, Eric freaks out over his conspiracy theory that Mary left Buffalo because of a devious scheme she concocted with Robbie. Chores are interrupted when Ruthie discovers a baby at the Camdens' front door. Lucy, meanwhile, stays with her friend Mike's near-catatonic mother for the day. Mary: Jessica Biel. Eric: Stephen Collins. Lucy: Beverley Mitchell.
Original Air Date: Jan 29, 2001