Desperate for date money, Dobie figuratively sells his soul to Chatsworth and agrees to fix the outcome of a $5,000 charity raffle.
A chemical concoction makes Maynard irresistible to women.
Dobie falls in love with a girl at school, but family tradition prevents her from marrying until a match can be found for her older sister.
Maynard guides a fellow student to become a singing sensation, then ponders if he should step aside when a big-time agent wants to take her on.
On a trip to Washington DC with the Gillises, Maynard gets mistaken for a rocket scientist and sought by foreign spies for his secret fuel formula.
Maynard temporarily gains super-strength. Mr. Gillis becomes his prize fighting manager.
Zelda is tired of being rejected by Dobie, while Maynard realizes that no other woman would put up with him.
A teenage celebrity's dog is lost and Dobie tries to find it.
Staying overnight at the Osbourne mansion with Dobie and his new girlfriend, Maynard is suspected of stealing jewelry from their safe when he is found sleepwalking.
Maynard doubles for a Latin American general while on vacation.
Thrown out by his mother, Chatsworth moves in with the Gillises for a while.
A test chimpanzee is doomed unless Maynard can show that he is more talented than he seems.
The song-analyzing qualities of a computer are transfered to Maynard, and cousin Virgil uses his ability to predict hit songs to become a singing star.
When Chatsworth's family goes broke, he gets Maynard and Duncan to help him raise money claiming it is charity for a needy family.
When a foreign student likes Dobie because he is simple-minded, Zelda decides to teach him how to improve his memory
Maynard and Herbert get struck in one of those finger toys just as Mr. Gillis is about to leave for a grocer's convention.
Dobie falls for brainy a Russian ballerina and solicits Zelda's aid to improve his grades. When that fails, he ends up dancing outside her window.
Chatsworth pays Dobie to take his place at a fancy dinner with old friends of the family, whose daughter he remembers as being particularly ugly.
Dobie is the new DJ on the college radio station. A mobster tries to give him payola to make his country-singer girlfriend a star.
A fugitive criminal and his girlfriend hold up the Gillises in the store. Maynard arrives and complicates the situation.
Performing at Pryor College, the Lettermen hire Dobie as an emergency replacement singer.
Dobie falls for a kitchenware heiress and wants to impress her by selling one of the man's Quickie-Cookers.
Duncan gets a role in a visiting production of William Tell and falls for a young opera star, unaware she has a jealous boyfriend.
To cure Maynard of his childish belief in Santa Claus, Mr. Gillis climbs down the chimney on Christmas Eve and gets stuck.
To avoid failing an upcoming test that will cause him to flunk out of school, Maynard drinks a potion that is supposed to turn him into a genius, but ends up transforming him into a monster.
Maynard and Duncan accidentally lock Mr. Gillis in the meat freezer, and think they've killed him.
Dobie and Maynard train a mynah bird to help them with their history exam.
An older woman teaches Duncan how to be rotten to succeed in the world so he'll be able to provide for her younger sister. But meanwhile the younger sister is falling for nice, honest Dobie.
Dobie pretends to be terminaly ill to gain a girl's sympathy. However, due to a mixup, Dobie is led to believe he's really in poor health.
Duncan and Maynard don't realize they loaded up the Gillis Grocery delivery truck with a case of nitroglycerin.
Dobie joins the football squad to impress a girl, but only succeeds in making her big bruiser boyfriend jealous.
Dobie's teenage cousin Duncan moves in with the Gillises and tells Dobie's girlfriend that Dobie needs help for a drinking problem.
On a class trip to an African jungle, Dobie is captured by a tribe of cannibals.
Mrs. Gillis's cousin Virgil visits and gets the Gillises to supply him with all he needs for a singing engagement.
Dobie names Thaila as his beneficiary on a life insurance policy, then becomes paranoid that she and Maynard are trying to kill him.
Maynard saves a suicidal jumper but falls from the ledge himself and is taken to a psycho ward.
