Wally begins to outgrow his "sloppy" faze and becomes much neater. This is noticed by Ward and June who try to encourage Beaver to undergo the same transformation. However, Beaver changing like that just seems too extraordinary of a task.

Beaver makes a trade with Larry Mondello: a glass doorknob for a Chihuahua. Larry found the dog in his garbage can, so when Beaver brings it home, Ward immediately breaks the news that he's going to place an ad in the lost and found and that Beaver probably won't be able to keep the dog. Despite this, Beaver quickly begins to grow close to the little pooch.

Ward helps Beaver and Wally build a miniature race car powered by a lawn mower motor and Ward makes the boys promise not to use it without him being with them. Later, Larry talks Beaver into taking it for a spin resulting in being pulled over by a traffic officer.

While playing baseball in the street with Wally, Chester and Tooey, Eddie hits a baseball through the Cleaver's window resulting in Ward forbidding the boys to play baseball so close to the house. However, later, Beaver talks Wally into pitching one, but this results in a broken car window.

After a week long visit with their Aunt Martha, Wally and Beaver prepare to head home to Mayfield on a train. After talking Martha into letting them buy their own tickets, they discover they're short the money after spending it on junk food and find themselves wondering how they are going to get home.

An eighth grade dance has Wally being pressured into attending with a girl, instead of going stag with Eddie. However, Mary Ellen Rogers becomes determined to have Wally take her and goes through Beaver to get to him.

Wanting to be liked by Wally's friends, Beaver makes up a wild story about the vacant lot next to his house being an Indian battle ground. After making a bet with Eddie, Beaver has Wally help him plant artifacts in the lot. However, that is forgotten when the kids make a discovery that they believe will make them rich.

After a weekend spent at the movies goes awry for Ward, he decides the boys should spend their weekends outside and plans a camping trip. However, when Ward's called into work, Wally and Beaver decide to camp out in the backyard.

Wally makes the baseball team and Ward openly shows how proud he is of him, leaving Beaver feeling inferior. Trying to impress his parents, Beaver tries out for the band and begins practicing the clarinet. However, Beaver soon finds himself with more problems when he's let go from the band.

June has Wally stay home from school when he comes down with a sore throat and suddenly Wally is emersed in attention from his parents, friends and doctor. Jealous and feeling left out, Beaver fakes illness, seeking that same attention.

Wally and Beaver are helping Ward clean out the garage when they run across Beaver's old teddy bear, Billy. Beaver reluctantly throws him away after Ward and Wally tell him he's too old for dolls. However, Beaver changes his mind but he's too late, the garbage truck came, which leads Beaver to take drastic measures to get him back.

Wally jumps at the chance to paint a couple of garbage cans for Ward, who offers 50 cents a piece. However, once Eddie tells Wally, that his father was charged $3.00 to have his painted, he becomes disinterested in the job which is when Beaver steps in and takes over the job.

An incident at the park leads to Beaver ripping the pants on his gray flannel suit. When he's questioned by Ward and June he makes up a wild story that his parents quickly see through. Lectured in telling the truth, Beaver does just that when the pants of his other suit are ripped but Ward and June don't believe him.

An old friend of Wally's stops by with stories about how great it is at the military school he attends. This leads Wally to decide that he would like to attend military school, despite a wary Ward and June.

An animal is chewing up June's flower bed, so Ward and the boys set a trap to catch it. They soon catch a white rabbit whom Beaver talks Ward and June into keeping. Beaver names him Henry only to later discover Henry is really a Henrietta and she's expecting.