Grandpa mixes up a love potion designed to make the opposite sex fall madly for anyone who drinks it.

Herman is suffering from insomnia. The only thing that will make him sleep is a late-night walk in the park. A 'monster' type creature has been spotted in the park at night and Lily would prefer if Herman would stay home. What she doesn’t know is that the monster is Herman!

Herman is struck in the head by a bolt of lightning from one of Grandpa’s experiments. It causes him to become so disfigured that he ends up resembling officer Francis Muldoon from CAR 54, WHERE ARE YOU? (or how Fred Gwynne looks without makeup). Lily hopes to restore Herman’s old face with plastic surgery.

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.

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.”

Herman buys a convertible for Marilyn from a fly-by-night used-car dealer named Fair Deal Dan. Once he gets it home, it explodes into a piece of junk. Herman later finds out that the car is a stolen piece of junk when he is placed under arrest.

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.

Herman gets promoted to hearse driver and has to renew his driver’s license. This requires him to take a road test, which he fails. Grandpa convinces him that he’d have better luck taking the test in a one-horse town. He turns out to be extremely correct.

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.

With inheritance money from Cousin Wolverine, Grandpa and Herman develop an invention for transporting an electrical current without wires. Lily and Marilyn use the rest of the money to operate their own beauty salon. Both endeavors turn out to be disasters, causing various parties to take legal action.

Eddie gives Marilyn a ring he found in the attic as a birthday present. Grandpa recognizes it as the Fregosi Emerald, a centuries-old ring with a Transylvanian curse. Herman doesn’t believe in such a silly superstition; he is intent on proving that the ring does not bring about bad luck. He quickly regrets trying to do this.

Eddie, an avid fan of ghoulish TV host Zombo, becomes the winner of the “Why I Like Zombo Contest” and gets to be on the Zombo show. Herman becomes jealous of Eddie’s new hero and wants to appear equally outlandish. But his efforts to impress his son fail. Eddie eventually learns that Zombo is not a real person but a phony character played by an actor.

A massive argument erupts between Grandpa and Herman after Herman accidentally destroys a go-cart the two of them constructed for Eddie. Since Grandpa claims to own half of the house, Herman draws a white line down its center and insists that Grandpa remain on his side of the line.

To cure Herman of his hiccoughs, Grandpa puts him into a trance with the Transylvanian Brain Freeze. Meanwhile, a couple of fraternity pledges are sent to spend a night in the Munster house as part of their initiation. Thinking that sleeping Herman is a dummy, they bring him to a sorority house, where he awakens from his trance.

In this Cold War episode, a Russian fishing trawler picks up a scuba-diving Herman in its haul of fish and mistakes him for the missing link. The crew members report their find to Moscow, claiming it puts the Soviets ahead in the “missing link race”. The response from the Commissar is that Herman is an American spy.

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.

Herman takes up amateur photography and accidentally snaps a picture of two men making their escape from a bank robbery. Herman has visions of getting a big reward for his evidence, but the bank robbers track him down and decide to hold up with the Munsters until the heat is off. This episode revisits the show’s recurrent fascination with criminality, especially bank robberies.

Herman and Lily want to buy each other an elaborate gift for their 100th Anniversary. Without telling each other, they both take night jobs as ship welders. Since the job requires them to wear protective helmets that conceal their faces, they don’t realize whom they’re dealing with when they start flirting with each other.

To provide poor unfortunate Marilyn with a future husband, Grandpa tries to turn a frog into a prince. Conveniently, he chooses a nearsighted frog who won’t be put off by Marilyn’s hideous looks. Not realizing that the potion has failed, Grandpa and Herman mistake a passing stranger for their princely frog.

While searching for a fuse box in the dungeon, Herman and Grandpa discover a secret chamber and a clue to the pirate treasure hidden on the Munsters’ property.

Herman tries to teach Eddie a lesson about the folly of gambling: he takes the money in Eddie’s piggy bank and bets it on a long shot at the racetrack. When the horse comes in a winner, it ruins the point of Herman’s lesson and leads to his entanglement with organized crime.

Herman has his ego flattered twice by his family. First, Eddie wants to enter him in the Father of the Year Contest. Next, Marilyn wants to sculpt a clay bust in his likeness. When she tells her art professor that the sculpture represents a living person, he plans to make a bundle from his discovery of a missing link. Herman is summoned to his office for an examination, but he’s under the impression he’s about to receive an award and a bunch of neat prizes.

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.

Herman becomes insanely jealous of Chester, a mysterious boarder whom Lily has bought into the household in yet another of her schemes to acquire a little extra cash. After searching Chester’s room, Herman concludes that he’s a gangster. In fact, he is a lieutenant for the police department.

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.