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.

Sandy's dreaded blind date turns out to be a ""King"" while David is ready to crown his brothers when they horn in on his date.

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.

College freshmen David, Rich and Burt have been feeling a little left out of the college social scene and decide to spark some attention by stealing a rival school's mascot, a wolverine, but when the fierce creature gets loose, it's every Hogan for himself. Meanwhile, Mark and Willie enroll Sandy in a computer dating service and she discovers this just as her date knocks on the front door.

After David fools the twins with a bald-faced lie, they turn the tables on the ""master of practical jokes"" by convincing him that his hair is falling out. Meanwhile, Michael chokes under the pressure of retaking his driver's test.

A nervous Michael dives into the dating pool bu doesn't make much of a splash, while David will stop at nothing to avoid immersing himself in an English assignment.

David has a crisis of conscience when he's attracted to the coed that best friend Burt has his eye on, but he's caught off guard when Burt throws down the gauntlet.

David lights a fire under his brothers to get them to help sweep out the chimney, but Mark does a slow burn when he gets wedged inside the fireplace.

Mark worries that he and his two left feet will trip over the light fantastic when Willie tells a girl that Mark likes, that Mark is a great dancer.

Sandy tries to teach Willie a lesson about cigarettes, but her efforts go up in smoke when she returns to smoking herself.

It's a dream come true for psychology student David when Sandy, ""Queen of the All-Nighters,"" agrees to be the guinea pig for his sleep deprivation experiment.

Sandy thinks she's hired ""Robo-Secretary"" after Mrs. Poole whips the entire school into tiptop shape. Meanwhile, Michael fends off the advances of an admirer.

Willie is stirred by first-hand accounts of apartheid from Sandy's South African professor, so he and Mark embark on an el-train ride to a candlelight vigil.

Mark and Willie are barely able to contain themselves when they spot a nude portrait of Sandy hanging in an art gallery.

Tired of being ""dull and predictable,"" Mark turns into a mini-James Dean, but his cool attitude only gets his family and friends hot under the collar.

David and a pretty student get off on the wrong foot, and they continue to bicker when they're fixed up on a blind date that could wind up opening their eyes to romance after all.

Love-struck David's girlfriend, Sara, receives a great job offer in Australia, so David decides to take the plunge and propose marriage, but Sandy and Michael think he's all wet.

David, Burt and Rich wager they'll have a wild weekend in Las Vegas, but they don't bet on ending up in jail. Meanwhile, Mrs. Poole displays some unusual talents.

Sandy and Michael endure twice the torture on a ""double date"" with the perfect prospective mates, while David decides to spend the evening bonding with his brothers.

David chafes under the Hogan house rules, so he moves into an apartment with Burt and Rich, who make Felix and Oscar seem like ideal roommates.

The numbers 4 and 0 add up to a midlife crisis for Michael, and Sandy only multiplies his distress when she throws him a surprise birthday party.

David puts himself in the penalty box over his guilt about injuring an opponent in a hockey game, and Mark threatens to body-check Willie for not paying a debt.

Willie wants to teach Mark a lesson in brotherly love when Willie's girlfriend decides she likes her tutor Mark better.

It's amore at first sight for David when Sandy's friend arrives from Italy to stay with the Hogans.