The Colonel (Peter Graves) arrives for an unexpected visit as school problems dog the younger Camdens: Matt flunks his chemistry pre-test; Simon struggles to find friends; and Ruthie chafes at being in a class taught by the insensitive Ms. Riddle. Meanwhile, Mary finds her job hanging by a thread; Lucy starts a campaign to become homecoming queen; and Annie gears up for her first test. Matt: Barry Watson. Simon: David Gallagher. Ruthie: Mackenzie Rosman.