After Valerie's sudden death, Sandy, Michael's sister, moves in, and finds her school-counseling job a breeze compared with what she faces at home: David tries to be a ""supermom,"" while Willie and Mark are at odds over a science project.

Rich and Burt assume more than they should after David has a study session with the new girl in school and he lets them assume that they are much more involved than they actually are. Quickly he learns he's inadvertently destroying a reputation.

While moving in some of Sandy's belongings, the boys dig up old stuff in the attic, one of which is an old lamp David made as a gift for Michael. However, unaware to anyone, the lamp sparks a fire causing the house to go up in smoke and the Hogans to temporarily move in with the Pooles next door.

There's a hitch in the twins' school project on marriage when Willie goes after Mark's wife while David tries to best Sandy at anything.

David reexamines his belief in God after his history teacher has a heart attack and David saves him with CPR.

David risks losing his best friend when he locks him in a closet to keep him from driving while drunk. Meanwhile, Sandy, Michael, Mark and Willie pay a visit to a resort that Sandy had invested in.

David's on a roll at predicting football games and decides to bet some real money, but he could be wearing cement sneakers when he loses big.

Mark brakes David's fast times at high school when a special program puts Mark in the middle of David's classes and his love life.

The boys are all set for an evening of terror, watching a horror movie. However, when it's over each one of them is scared stiff and go on to experience their own version of ""Nightmare at Zombie High.""

Fresh from his triumphant A-plus in English, Willie crumbles under the pressure of composing a poem, while Sandy and David lose it when they lose Mrs. Poole's beloved dog.

Crushed by a girl's rejection, David's pal Burt falls hard for Sandy, while Sandy thinks her principal's the one with romance on his mind.

Sandy's ex-husband makes a move to get back in her life. Meanwhile, David moves into Michael's poker game.

There's a certain chemistry between David and his science teacher, while Sandy has a solution for a depressed Mrs. Poole, who's without her husband on their anniversary.

David's advice to Mrs. Poole to vent her anger against her overbearing mother-in-law backfires when Mother Poole moves in with the Hogans.

An eager Willie and a reticent Mark ditch school for the day, but when Mark gets caught, Willie feigns ignorance about the whole scheme.

Restaurant worker David smells trouble and it's coming from the kitchen as he tries to fend off the amorous advances of his boss's fiance. Meanwhile, Michael teaches Mark how to defend himself.

Man's man Skip returns and takes Michael and David for a ride in a small plane, but when they're forced to bail out all of their lives are put in jeopardy.

The boys recruit an enchanting if ditsy housekeeper for Sandy, but she turns out to be ""a lust cause"" for David.

Michael and David's father-son retreat turns into a last stand when they get stuck in the Pooles' garage, while Willie and Mark get an X-rated tape stuck in the VCR.

Michael experiences close encounters of the most embarrassing kind when his friends find out he saw a UFO. Meanwhile, the twins' refusal to give David an extra Springsteen ticket sends his high hopes plummeting to earth.