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

Urkel develops hiccups after being robbed.

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.

After failing to foil a robbery, Carl is assigned to protect Urkel, who stopped the thief; the boss's daughter comes on to Eddie.

Eddie and Urkel don't tap dance around the fact that Waldo is a klutz on the basketball court, so Waldo takes tap dancing lessons to improve his agility. Elsewhere, getting accepted to Harvard means the world to Laura, until she l earns her parents can't pay the tuition.