Marilyn (Beverley Owen) goes as Priscilla, Lily (Yvonne De Carlo) is Little Bo Peep, Grandpa (Al Lewis) is Napoleon and Herman (Fred Gwynne) is King Arthur in a suit of shining armor.
Workers digging for a gas pipeline 25 feet (7.6 m) underground accidentally reach Grandpa's laboratory in the dungeon of the Munster's house.
Mr. Hadley (Walter Woolf King), the president, is convinced the pill works and sends Dick Prince (Grant Williams) to close the deal with Grandpa.
The prize includes $5,000, and in order to win the money the magazine must send two reporters to spend a couple days with the family.
Guest star: Harvey Korman as Lennie Bates, Fred Beir as Chip Johnson and Roy Roberts as Mr. Morgan Herman and Grandpa have a fight.
Herman goes to talk to the dean, but is mistaken by Coach Roger Denman (Frank Maxwell) for college basketball recruit Moose Mallory (Robert Easton).
When they see Herman's name in the paper, the family realize that he messed up and Marilyn still can't go back to school.
Lily finds an invitation inside Marilyn's bureau drawer for a "Parent's Night" taking place at her school.
Lilly won't feed, speak to or let Herman into their bedroom after he comes home from an office party past midnight.
Note: At the party the Standells perform a cover of The Beatles's "I Want to Hold Your Hand," Herman improvises a beatnik poem, and Lily sings the English folksong "He's Gone Away" while playing the harp.
Grandpa receives a mysterious call claiming that Alan plans to elope with Marilyn and that he is only interested in Uncle Gilbert's money.
After hearing a joke from one of the policeman, Herman wakes up laughing inside of the museum van and scares the scientist and the policemen.
Then, using his magic potions, Grandpa turns into a beautiful woman, in order to help Herman in a plan to make Lily jealous.
Since Herman has no discernible talent, Grandpa conjures up a pair of magic ballet shoes that will make him a gifted dancer.
Fearing Lily's reaction, Herman makes up a story that his boss will take a few days to think about it.
Herman saves the life of a young boy named Galen Livingston Stewart, by bending the bars of a fence that his head is stuck between.
Grandpa and Lily show up at the boat and find the crew giving Herman a farewell party with singing and dancing.
Eddie's misguided regard for his father's natural abilities prompts the young Munster to enter Herman in the bucking bronco contest at the local rodeo.
Herman has taken up photography as a new hobby and inadvertently snaps a picture of two bank robbers leaving the scene of the crime.
Still wanting to surprise the other with an amazing gift, Herman and Lily individually acquire part time jobs at the Cleaver Employment Agency.
After finding a gun and surveillance equipment in Chester's room, Herman and Grandpa are convinced their guest is on the wrong side of the law.
The rest of the family assume Ted is the frog, turned into a prince, and promptly tie him up in the basement while getting Marylin's black wedding gown ready.
While searching for a fuse box in the dungeon, Herman and Grandpa discover a secret chamber and a clue to Henry Morgan's pirate treasure hidden on the Munsters' property.
Eddie is being bullied at school by Jack McGinty, and Herman is continuously being tricked by practical joker Clyde Thornton at work.
Herman advises his son to turn the other cheek, but when both come home with a black eye, they decide it's time to retaliate when provoked.
A lightning bolt strikes Herman in the head, disfiguring him so severely that he ends up resembling a normal person.
Herman buys an old Chevrolet convertible for Marilyn from disreputable used-car dealer Fair Deal Dan (Frank Gorshin).
Mistaking the frozen Herman for an elaborate dummy, they sneak him out of the house to leave him at the Alpha Kappa Sorority as a prank.
Note: Guest star Ken Osmond had appeared as "Eddie Haskell" in Leave It to Beaver, whose creators/producers Joseph Connelly and Robert "Bob" Mosher also produced The Munsters.
The driver of the vehicle thinks she has disfigured Herman for life and offers him a cash settlement by mail in the hopes he won't sue her for everything she has got.