When Arnold and Sam creep through the crevices of the neighborhood's haunted house they find the ghost boasts a bounty of surprises--the biggest being a love for people and contempt for war.

Arnold thinks the school science fair is the perfect opportunity to sabotage the project of his least favorite female classmate, but with a closer look he wonders if her aggravating behavior is really a cry for help.

The Drummond household is faced with Sam's bed-wetting problem trying everything from scolding to fawning, only to have Sam become more frustrated and hurt.

Willis becomes the middleman in a police effort to halt use and trafficking of drugs at his high school.

Arnold risks expulsion from school when he leads a strike against some new rules he feels are ""unfair.""

Sam must choose between a penthouse apartment and a honky-tonk club when his real father comes knocking on the Drummond's door, wanting to take Sam with him.

""The Gooch"" returns to taunt Arnold and take on a new target--Sam, only to face his first challenge in the Drummond's new neighbor, an Italian foreign exchange student.

Entrepreneur Arnold reluctantly allows Sam to be a part of his new scheme, when Sam realizes only Arnold will reap the profits, he breaks up the partnership and becomes the competition.

When Arnold is appointed judge of the school court, he is suddenly faced with jeopardizing a longtime friendship or losing a date with the school heartthrob--everyone has their day in court.

Drummond's surprise meant to encourage an Olympic hopeful felled by a tragic accident backfires when the young man instead becomes embittered at meeting the 1984 Men's Olympic Gold Medal-winning Gymnastics Team until Willis and Sam take on the challenge of setting things right.

Drummond is a tower of strength for Sam as he prepares to have his tonsils removed, but what will happen when Drummond finds out he is to be Sam's roommate while having some ""minor"" knee surgery.

In order to be elected the entertainment chairman for a school charity fundraiser, Arnold promises to get a celebrity but when it's time to deliver, he's forced to look to his nemesis Carmella for help, hoping she can save the day.

Sam persuades a reluctant Mr. Drummond to become the coach of his bad news baseball team and then regrets it after he winds up on the bench.

When Sam visits a taping of ""The Sandy Squirrel Show"" he is overcome by the news his favorite television idol is about to be cancelled, but it's big brother Arnold to the rescue as he rallies the Boy Scouts of Manhattan to demand the Squirrel be given a reprieve.

The Drummonds are concerned when the normally lovable Sam battles with a cynical senior who rejects the Cub Scout's ""Adopt A Grandparent"" program, leaving Sam with a tainted view of older people.

Kimberly returns home from school in Paris to surprise Drummond on his birthday prompting Arnold and Willis to try and match her special gift, they decide to change their name to Drummond, until Willis suddenly has second thoughts.

Sam is taken aback when he realizes his new ""buddy"" is a girl, but Mr. Drummond is even more dumbfounded when the kids want to have a sleepover.

When Arnold's rocket for his school project is accidentally set off and lands atop the Russian Embassy, the state department is led to suspect the Drummond's participation is foul play.

Arnold's attempt to stop a friend from drinking backfires as he's left standing in the boy's bathroom holding a bottle of booze when the teacher walks in.

A camping trip with Arnold and Sam intended to strengthen Drummond's relationship with Sam goes awry when Sam's real father shows up and invites himself along.

Arnold is faced with a dilemma when his friends insist he take a cute cheerleader to the dance instead of the girl Arnold really likes who they consider an ""ugly duckling.""

When Drummond is accused of being out of touch with his employee, he secretly takes a job in one of his own factories working on an assembly line. Much to his surprise, his job is threatened when he makes suggestions to boost morale and improve production.

Although Arnold boasts he held his own in a mugging, Drummond fears the incident goes deeper than Arnold will admit and becomes concerned when he finds Arnold has sought a dangerous method of protection.

Arnold and Sam's new friendship with a street performer gets mired in fear and confusion when they discover she has epilepsy.

A family whose little boy died, forces the father to kidnap Sam, who is shopping for some snacks in a grocery store. After the kidnapping, the man threatens to kill Sam's parents if he attempts in any way to escape.

The Drummonds, desperate to get Sam back, go on the news to try and advertise to get Sam back. In the meantime Sam risks everything to tell the Drummonds where he is.

Guarding the school bully's girlfriend, Ramona, seems like a simple task to Arnold, until his natural Jackson ""charm"" creates some problems, Ramona falls head over heels for him and Herman, the bully, wants to rearrange his face.

Sam and Arnold fear that the time their parents are spending apart is a symptom of an ailing marriage and the boys attempt to give them a dose of romance, hoping it will be the cure that will keep them from divorce.

Willis takes a big step when he leave home for college, but fears his initiation to dorm life is only one of the freshman experiences he may not be ready to handle.

Arnold's dream of becoming an ""overnight"" success as a photo-journalist run headlong into reality when he gets his first job on a local newspaper.

Kareem Abdul-Jabbar guest stars as a high school English teacher who gives Arnold a ""classic"" punishment for ""goofing off"" in class and the freshman quickly learns his lesson when his penace is teaching ""A Tale of Two Cities"" to his rowdy classmates.

A music instructor ""backs up"" Arnold after he claims to be an expert sax player in order to impress a girl.

Father and son are feuding over First Amendment rights when an outraged Arnold objects to a white supremacy organization speaking at his high school and a discerning Drummond can't support Arnold's fury on the basis of the American right to free speech.

Arnold succumbs to peer pressure and boasts he went ""all the way"" with his girlfriend, but his lie puts him in a more awkward position once the girl finds out about his claim to fame.

Drummond has ""insured"" that Sam will have an unforgettable birthday party by arranging for a local television personality to be the main attraction, until the swash-buckling ""Captain Jack"" steals the show and the birthday boy jumps ship.

Arnold's initiation into the ""cool"" club at school jeopardizes his friendship with the mildly-retarded dishwasher at the Hamburger Hangar, after a prank Arnold ""must"" pull causes the man to lose his job.

Arnold suspects that Kimberly has an eating disorder when his slender sister is secretly gorging himself, but not gaining any weight. Arnold seeks Drummond's help in confronting Kimberly with her problem and the family comes together to help her fight the eating disorder, bulimia.

Arnold's preoccupation with girls and school leaves younger brother Sam alone and bored until Willis steps in, takes over as ""big bro"" and causes a row when Arnold decides to fight back for the title.

To prevent Drummond from seeing his ""F"" in geometry, Arnold arranges to have Drummond's signature forged on his report on his report card, but the scheme backfires when Drummond insists on a personal inspection of Arnold's grades.

Sam's contempt for a classmate who incessantly insults and badgers him is pacified when he learns that the boy is an orphan who's jealous of Sam's ""perfect"" family life.

A date with a gorgeous girl has Arnold walking on a cloud, until he learns she was bribed by Willis to go out with him.

Arnold is disgruntled over being partnered with archenemy Lisa in photography class but his frustration soars when the two are accidentally locked together in the basement darkroom.

Arnold's feature story about his high school football team threatens to turn into a controversial expose for the school newspaper when he witnesses team members buying steroids.