Lucius gets sick of Jimmy, Heloise, and Beezy bothering him by acting out their favorite show "Super Slugmeister," so he tricks them into competing against each other for the non-existent role of Slime, Super Slugmeister's sidekick.
When Jimmy is denied cool things because he is a child, he uses Heloise's machine to turn him into an adult. Unfortunately, the effects backfire, and he continues to age into an old man.
Cerbee saves Lucius' life, so Lucius lavishes him in gifts and luxury. Jimmy then has to convince Cerbee to come back.
After everyone in Miseryville is blinded, Jimmy takes the opportunity to do everything he's always wanted to. But when the blindness wears off earlier than he expected, he's forced to run around town naked!
A new girl, Mean Jean, moves into Miseryville and challenges tennis with Heloise for the title of "Queen of Mean".
Jimmy and Beezy accidentally break a truce between the Heinouses and Weavils on Weavil Day.
Worried that Beezy will embarrass him at a new statue unveiling, Lucius attempts to reform Beezy into a gentleman, with some help from Butley.
Jimmy begins being haunted by a ghost couple who originally lived in his house. They need his help to retrieve a toaster they lent Lucius years ago, to travel back to Ghostville.
It is Lucius Heinous the Sixth's birthday, so he is thawed out for the whole day and Lucy makes Jimmy spend time with him, but all Lucius VI wants to do is spend some time with him his son. But when LHVI tricks Jimmy into bringing Lucius over, he freezes his son and takes over Miseryville. Now Jimmy and Lucius must devise a way to take Miseryville back.
Jimmy wants to play as a goalie with Wreckum but he doesn't play good, so Heloise gives Jimmy help from the sidelines in exchange for Jimmy to spend time with her, but Jimmy spends all of his time with Wreckum and none with Heloise, so she quits helping him and makes Jimmy play his own way. But Jimmy turns out to be an average player.
Jimmy does a favor by standing on a spot for a rhino-man and unknowingly participates in a contest requiring someone to stand on the rock for 24 hours straight, after which the winner will receive all of Lucius' fortune, so Lucius uses several plans to get Jimmy off the spot before time runs out but they all backfire.
Heloise knits a love-sweater for Jimmy and a fear-sweater for Beezy, but her plan backfires when the boys decide to switch sweaters.
Jimmy creates the perfect sandwich, but a wild-west cowboy, "Cowboy Stackhouse," claims it and believes it to be a real lady. Jimmy must then convince him the sandwich is actually alive.
The residents of Miseryville complain about the conditions of the city, so Lucius Heinous VII creates a "suggestion box" for everyone to put their ideas in. Although it was simply made so Lucius wouldn't have to deal with everyone's problems, Jimmy sets out to actually improve Miseryville.
Jimmy reveals the secret about a hidden Miseryville snowrilla named Mitch and Bob, so Lucius then sets out for their fur coat.
Jimmy and Beezy are using apps on their MiseryPhones which leads them, Heloise, and Lucius to be held captive by the Schwartzentiger.
Beezy uses his allowance to buy almost everything in Miseryville until Lucius takes all of it.
Jimmy and Beezy start wondering what Heloise's feet look like, which drives her crazy. So she and Lucius team up to scare Jimmy and Beezy.
When Jimmy cleans Beezy's house, he throws out all of Beezy's ABC gum collection, so Jimmy must go through Miseryville to bring back all of the gum.
Beezy loses a horn and is waiting for a visit from the Great Horn Fairy because when you lose a horn, you get gold, so Jimmy pretends to break a horn and is put on a trial.
Jimmy hides an alien outsider from the military.
Beezy reunites his relationship with his grandfather which makes Lucius jealous.
A mysterious person cleans up Miseryville and Detective Jimmy wants to solve it.
After Samy gets fired Jimmy tries help on his acting career, but instead Samy works for the weavils by telling embarrassing jokes about Lucius Until Lucius Starts to miss him.
Jimmy accidentally turns a compliment doll into an insulting one.
Jimmy challenges the Rodeo Clowns to a funny face-off.
When Heloise finds out Jimmy and Beezy had a secret list of "Guy Stuff" they won't let her see, she disguises herself as a boy named Herman to steal it - while Herman is actually Heloise's temperamental cousin.
Lucius uses all the water in Miseryville for his own pool, and ends up getting stuck on an island with Jimmy. Meanwhile, Heloise has a picnic she had set up for her and Jimmy which Beezy crashes.
Miseryville is holding a father-son race and Lucius wants to win but Beezy is lazy, so he lets Jimmy run in Beezy's place until Beezy gets mad at his dad's choice. Will the Heinous' win or will the weavils' win?
When Heloise receives a gift and a letter from J2S, she believes that it's from Jimmy but turns out it's from Peep, she then goes on a date with him when she finds out Jimmy's jealous.
When Lucius' deciding bird, Lovey, flies away, Jimmy, Beezy, and Heloise go out to find her so Lucius will give them his giant TV.
Jimmy can make anyone in Miseryville laugh except for a creepy man named Mr.Ten because Heloise stopped him from laughing again.
Jimmy, Beezy, Heloise, and Lucius all pull pranks on the clowns that ultimately backfire.
Jimmy and Beezy fall for a girl named Arianna. They have a competition to see which of them Arianna likes more.
To steal a Mad Scientist's Award, Dr. Scientist makes Heloise sneeze off her own head.
Jimmy is the only one in Miseryville that can't whistle, so he gets help from a pickpocket named Peep.
Heloise begins to act strangely when her aunt comes to visit.
Jimmy gets a new pair of shoes, but soon finds he misses his old ones.
When Heloise creates a robot duplicate of herself as her assistant, Jimmy falls in love with it. Heloise becomes jealous and tries to get rid of the replica Schmeloise.
When Beezy hires a mule to be the star of his talent show, Jimmy becomes jealous and gets help from Heloise to sabotage the mule.
Heloise has a romance novel about two characters who are like her and Jimmy, but when she finds out the last page is missing she goes on a quest to find the author.
When Jimmy swallows an invention of Heloise's that causes bad luck, he accidentally brings misery everywhere he goes.
Miseryville is taken over by Zombie Pickles and it is up to Jimmy to save the town from disaster.
When a very special flower blooms, Lucius declares it is spring break in Miseryville and everyone is heading to Misery Island (the non- miserable side) to celebrate. Jimmy and Beezy take a rocket there but they end up on the other side of the island thinking it is the right side. Meanwhile, Heloise waits for Jimmy to arrive.
When Lucius is attacked by a horrifying monster, Beezy and Jimmy offer to help but Heloise believes she can do a better job. The three of them get into a fight to see who can be the best hero.
When Beezy sells all of Lucius's riches for Lemonade, it is up to Jimmy to help Lucius get rich again.
When Beezy catches Heloise saving a panda (or what he thinks is saving) he and Jimmy decide to start a Heloise fan club for all the pandas who now adore her.
After Heloise builds a marvelous plane for Lucius, Jimmy sneaks on board with a dream to fly it.
After Lucius forbids Beezy from hanging out with Jimmy, he pranks his father by pretending to be friends with a Weavil.
When Heloise makes a machine to make herself more intelligent, Beezy accidentally becomes smarter instead.
Jimmy and Beezy leave Miseryville when they believe they've broken something valuable.
Jimmy catches Heloise and Beezy sneaking off to enter a dance contest. After they tell him he can't dance with them he decides to enter by himself.
