When accident-prone Steve is blamed for a chemistry lab explosion, Laura represents him at a school trial.

Hard times bring distress for the unemployed Harriette and for a homeless and eccentric janitor [ Poston ], who get s trapped in the school bomb shelter with Good Samaritans Urkel and Carl.

Urkel and Carl risk their lives to save the distraught Mr. Looney from committing suicide when he is jilted on hi s wedding day; meanwhile at home, Laura fumes when her parents are more protective of her than of Eddie.