Beaver has the chance to travel around the country for six weeks during the summer and he's all excited about it. However, he quickly realizes when he's gone Gilbert will go after the girl Beaver has a crush on, Mary Margaret. Fortunately, he quickly realizes there's more to life than Mary Margaret.
After graduation, an all-night party is set to begin, which has June and Ward very wary. They aren't sure if they should allow Wally to attend. Meanwhile, Wally's date for the party has the same problem. This leads her to invite Wally to meet her folks and put their worries to rest.
Wally and Eddie fall prey to Lumpy's practical joking after he plants cherry bombs under the hoods of Eddie's car and Wally's car. Both Eddie and Wally want to get him back but their plan goes awry when they destroy Lumpy's car after chaining it to a tree. All fingers point to Wally after Fred finds that the chain has Ward's name printed on it.
It's come down to the final week before junior high school graduation and Beaver is having a ball and even skips a class with Gilbert. However, Beaver becomes convinced he won't graduate after Gilbert and him take a peek at the diplomas on Mrs. Rayburn's desk and find Beaver's diploma to be missing.
Eddie is happy to break the news that he plans to spend his summer on a fishing boat in Alaska and this prompts Wally and Lumpy to think about signing up to do the same thing. However, they all get a dose of reality when they discover just what kind of conditions they would be living in.
A school dance has Beaver with a major dilemma: he has two girls who ask him to go with them. However, he has a little problem, he accepted the first invitation but now wants out of it when he's asked by the second girl. This leads him to take some of Eddie's poor advice.
Beaver has been assigned to write a book report on The Three Musketeers. However he's waited right down to the wire to get reading and quickly realizes that he'll never get finished. He decides to watch the movie that's going to be on TV and write his book report based on the movie.
Eddie has been seeing one particular girl, Cindy Andrews and she wants to give Eddie a birthday gift, so she decides to knit a sweater. She uses Wally as a model and he begins spending so much time at Cindy's that he arouses the suspicions of Julie, Eddie, Lumpy, Beaver and his parents.
Wally has his mind pretty much made up about going to Ward's alma mater, State University and he's even considering joining Ward's old fraternity. However, both Eddie and Wally think twice when they hear from a college student that it's the worst fraternity on campus, but Ward has already sent out his letter of recommendation for both of them.
June and Ward go away for a couple of days and leave Uncle Billy to stay with Wally and Beaver. Beaver quickly realizes Billy runs a much looser ship than Ward and June and feels as if he can get away with more things. However, he's soon in for a rude awakening when he helps Gilbert sneak into the movies.
Beaver is all set to go with Eddie and Wally to hook up an AM/FM car radio in Eddie's car, but June stops him and insists he go to the grocery store to pick up the items as he had promised. This leads Beaver to give June the cold shoulder treatment while playing up to Ward.
When Wally is notified that the State College scholarship he applied for went to Lumpy Rutherford instead, he graciously throws a party to celebrate with his friend and secretly helps out after Lumpy gets disappointing news.
June and Ward have noticed the Wally has been spending quite a bit of his time at the movie theater but it's not to see the movies. He's been eying the pretty young lady who works in the box office. Thanks to Eddie, Wally works up enough courage to ask her out but quickly sees another side to the young lady that is a bit too mature for Wally's taste.
Beaver has gotten a job as a caddy and is quickly running around the golf course chasing balls. However, all innocence is broken when one of the guys Beaver is caddying for cheats in order to win a bet. Soon, Beaver begins wrestling with his conscience over whether or not to tell anyone.
Eddie agrees to use his new credit card to buy a battery for Wally's car. After Wally pays him back, Eddie uses the cash to buy some clothes. When Eddie's father confronts him about the large bill, he lies and says that Wally didn't pay him back.
Beaver and Gilbert go to a carnival and Beaver surprisingly wins a fourteen caret gold locket in one of the carnival games. Beaver thinks about giving it to June but thanks to Gilbert, Beaver decides to give it to a girl whom he has a crush on. However, soon it becomes apparant that this was a mistake when the girl's parents discover Beaver's gift.
Beaver has been given an assignment in which he must write a autobiography for class but isn't sure about his abilities at writing. So, he convinces a girl, who likes him, to write it for him. When she discovers that he is merely using her, she writes an outrageous life story and hands it in, causing embarassment for Beaver when the teacher reads it in class.
At school, Beaver gets into an argument with a girl who retaliates by making fun of Beaver's hair, calling him a sheepdog. Incredibly self-concious, Beaver goes out to the store and buys different hairsprays and gels to try to improve his hairdo. He doesn't get the reaction he was expecting when he tries his new hairdo out on his family.
Beaver wants to join a record club and asks Ward for the money to join. Fed up with Beaver constantly asking for money, Ward decides to put him on an allowance. However, Beaver is so thrilled with his records he disreguards the bills for them and quickly finds himself swamped with records, a rising bill and not enough allowance to pay for everything.
The news that Eddie has moved out of his parent's house and into an apartment of his own has June worried that Wally may be contemplating something similar. However, Wally gets a picture of just how ""happy"" Eddie is being on his own and it makes him think twice.
After coming home late on a school night, Ward and June punish him by not allowing him to go anywhere on school nights. Beaver feels the punishment is unfair and when Eddie suggests Beaver write to an advice column but is disappointed with the response.
Wally and Eddie get jobs at the Mayfield Dairy thanks to Ward pulling some strings. They soon unknowingly find themselves involved in a plot started by the foreman and his assistant who are secretly stealing the merchandise. When Ward learns of the plot, he warns Wally who in turn tries to warn Eddie, but Eddie doesn't buy it.
Now that Wally is 17, he feels it's about time that he get his drivers license. However, June and Ward are a bit apprehensive about the idea of Wally driving but Wally is persitant and finally gets his parents to agree to let him take a drivers class.
Beaver is scheduled to recieve a football award at a father son dinner being held in the school gym. While talking with his friends, Beaver learns that none of them are planning on wearing a jacket and a tie so when June and Ward insist that he wear one, he adamently refuses.
Wally has been constantly spending his time at Julie Foster's house and June suggests that he's old enough to take her out on a dinner date. Julie suggests a new expensive restaurant called The White Fox. However, during the meal Wally discovers that he forgot his wallet at home.
Leave It to Beaver is an American television situation comedy about an inquisitive and often naïve boy named Theodore "The Beaver" Cleaver and his adventures at home, in school, and around his suburban neighborhood. The show also starred Barbara Billingsley and Hugh Beaumont as Beaver's parents, June and Ward Cleaver, and Tony Dow as Beaver's brother Wally. The show has attained an iconic status in the US, with the Cleavers exemplifying the idealized suburban family of the mid-20th century.