Marilyn’s boyfriend, Tom Daily, invites the Munster clan to a masquerade. Eddie remains at home with Mrs. Morton as his sitter. Marilyn goes as Priscilla, Lily is Little Bo Peep, Grandpa is Napoleon and Herman is King Arthur in a suit of shining armor.

Herman and Grandpa overhear Lily and Marilyn talking and somehow get the idea that Lily is pregnant. What’s really happening is Dr. Dudley’s son, Elmer, is coming to stay with the Munsters while Dr. Dudley and his wife are on vacation.

Herman becomes a professional wrestler called The Masked Marvel. After he shows that he has superhuman strength to a friend of Eddie’s who is the son of a pro wrestling manager. Herman uses the extra cash to save for Eddie’s college education. However Herman is so nice and gullible his opponents can take advantage of him.

After going to the car to find something Herman falls asleep in the back of his car with the keys in the ignition. The car is then stolen by bank robbers who don’t know that Herman is sleeping in the back seat. When Herman wakes up he wanders into their hideout and is thought to be Big Louie, a gang member who has taken twenty years of beatings in the boxing ring. Herman winds up as an accomplice in a bank robbery.

Herman takes the family on a camping trip in a national park. After a dinner by the campfire, Grandpa hears the howls of the wolves and remembers his days in the old country. The next morning, Grandpa is missing. Lily realizes that he changed himself into a wolf to roam the woods with his canine friends. When she hears a news report about the capture of a rare Transylvanian wolf, Lily goes to the authorities to reclaim her father.

Herman goes to the dean’s office of Marilyn’s college to straighten out a tuition matter. When searching for the office, he wanders into the gym and is mistaken for a student basketball star who is expected for a tryout. Herman amazes the coach with his superhuman abilities and is offered a contract to play for the college team.

When Herman fools around with a ham radio in Grandpa’s dungeon, he thinks he’s contacted Martians. But he is actually speaking to two kids who are fooling around with walkie-talkies and just pretending to be Martians. The kids think Herman is also a kid, and a stupid one too.

Herman goes out each night in order to practice becoming a real detective. Lily thinks he’s having an affair with another woman and hires the same detective agency Herman is working for to have Herman followed. In a Plot twist Herman gets the assignment to follow himself.

The Standells, a rock group from Hollywood, are in town for a club appearance. They want a secluded place to stay in order to escape from their screaming teenage fans. Their manager pays an exorbitant fee to the Munsters to use their house for the weekend. The Munsters pack up and relocate to a hotel, but they can’t get adjusted to its cleanliness and normality. When they arrive home prematurely, they find The Standells singing, “I Want to Hold Your Hand”, and throwing a wild party filled with far-out beatniks and hipsters. The Munsters are initially shocked, but soon find that they fit in with these freaky people – who never once question their unusual appearance.

In order to accept a promotion, Herman has to shuffle his family off to Buffalo. Eddie, who happens to be doing great on the baseball team, throws a temper tantrum. Since Grandpa has already sold the house to a wrecking company, the Munsters have no choice but to wage war.

A pair of con artists want to stage a phony accident as an insurance company scam. All they need is someone to play the part of the victim – preferably a big stupid guy with a face that looks as if it’s been in an accident. When they stumble upon Herman, they realize they’ve found the perfect guy. Posing as a couple of movie producers, they get him to sign an accident policy by pretending it’s a movie contract for a remake of DOUBLE INDEMNITY. As the crooks devise various ways to kill off their leading man, Herman becomes a stuck-up actor.

Leo Durocher, manager of the Los Angeles Dodgers, needs a power hitter for his team. When he gets conked on the head by one of Herman’s line drives from seven blocks away, he believes he has his man. He tracks Herman down and asks him to try out for the team. After Herman demonstrates his powerful force as a batter, Durocher comments: “I don’t know whether to sign him with the Dodgers or send him to Vietnam.”

The Munsters receive $180,000 in gold doubloons from Uncle Gilbert in Transylvania. When their bank’s assistant manager arrives to pick up the money for deposit, he instantly falls in love with Marilyn. Grandpa and Lily do their best to encourage the romance, not realizing that this gentleman is only after Marilyn for her doubloons.

Herman arranges to meet Marilyn at the natural history museum. But he accidentally gets himself locked inside an Egyptian sarcophagus, whereupon a sleeping pill he swallowed earlier takes effect. A pair of museum curators open the box the next day and mistake the sleeping Herman for an ancient mummy. When Lily reads about their supposed scientific discovery in the newspaper, she goes to the museum and requests that the curators put Herman in a cab and send him home as soon as he wakes up.

Fearing that she is not useful around the house, Lily searches for a job. She eventually lands a position as a fashion model, causing Herman to become wildly jealous as he entertains fantasies about the suave men she’s liable to mingle with. With Grandpa’s help, Herman transforms himself into a swinging playboy. Grandpa, in a disguise, poses as his beautiful blonde girlfriend.

Eddie, under the impression that his father is the greatest driver in the world, volunteers Herman in a drag-strip competition. After souping up the Munster Coach and dressing up like Marlon Brando in his Wild One days, Herman loses his car in a drag race. In a rematch, Grandpa races in the Dragula, a motorized coffin on wheels.

Egged on by Lily, Herman demands a raise from his boss Mr. Gateman. He is promptly fired. Herman is afraid of Lily’s reaction, so he pretends that he is still going to work when in fact he is searching for employment. He gets fired from a number of blue-collar jobs – including one at a Chinese laundry, where he wreaks total slapstick chaos.

Herman saves the life of a young boy, Galen Livingston Stewart, by bending the bars his head is stuck between. They immediately become close friends. The only problem is that Galen’s parents think Uncle Herman is a figment of the boy’s imagination. They take him to a psychiatrist, played by Harvey Korman with a broad German accent.

Eddie is upset that his family does not treat him cruelly because he thinks this means they don’t care about him. When Eddie decides to run away from home, Herman employs a little child psychology, which naturally backfires. Various circumstances eventually lead to Herman’s getting involved with a dancing bear.

In yet another example of Eddie’s misguided regard for his father’s natural abilities, the young Munster enters Herman’s name in the bucking bronco contest at the local rodeo. Lily is unable to talk Herman out of such a dangerous task: he is intent on being a hero to his son in spite of the fact that he’s scared stiff. Meanwhile, the promoters plan to have Herman ride a horse that is guaranteed to break every bone in his body.

When Herman visits the hospital to see Eddie, who is having his tonsils out, he is mistaken for an accident victim and is immediately given a dose of laughing gas. Grandpa rescues him and brings him home, where Lily assumes that Herman has been drinking.

Eddie borrows a tape recorder belonging to the disc-jockey father of one of his friends. Herman records a version of DRY BONES, accompanying himself on the guitar. The following day, the disc jockey plays the song on his radio show – and it becomes an instant hit. Herman identifies himself as the mystery singer and quickly turns into an egomaniacal would-be celebrity. Grandpa comes to the rescue with his Nothin’ Muffins.

The Munsters’ pet Spot runs away from home and is mistaken for a dangerous monster when he is sighted in the sewer. When Herman goes down the manhole to search for Spot, he too is mistaken for a dangerous monster. The Mayor vows to rid the city of these menaces by using TNT.

The Munsters are heading for a vacation in Buffalo Valley when Herman gets off for a rest stop at Indian Flats. He wanders into the village of an Indian tribe that specializes in luring the tourist trade. The tribe’s eldest member mistakes Herman for an ancient spirit leader.

Dr. Victor Frankenstein IV from Germany visits Mockingbird Heights and brings with him Johann, Herman’s look-alike cousin. Johann is quite primitive and behaves like the Frankenstein monster from the movies. It is up to Herman to try to civilize him and teach him English. Lily is not informed of this; mistaking Johann for Herman, she takes him away for a romantic weekend getaway.

Herman is struck by a car. He isn’t hurt, but the car that struck him is totaled. The uninjured driver assumes she has disfigured Herman, and her attorney suggests that she try to settle with him for $10,000. When Herman receives the offer, he wrongly assumes that this is the amount he owes for the damage he caused to the car. He runs away from home rather than face the problem of financial ruin for his family.

When Eddie reads a school composition entitled “My Parents – An Average American Family” to his class, his teacher believes the boy is exhibiting symptoms of an overactive imagination. The school principal suggests that Eddie’s wild exaggerations might be motivated by an underprivileged home life. It is decided that a visit to the Munster home is in order.