On Bunsen's first day at Muckledunk Middle School, Amanda slips beets into his beverage, whereupon he becomes a monster. / Mikey and Darcy attempt to assist Bunsen in reuniting his head with his body, lest a new evil head appear and create complete havoc.
At Bunsen's house, Amanda pretends to be a beast and plays "Hide and Go Freak" with Bunsen. / As Amanda plots to cause trouble for Bunsen at school, she brings an ice cream truck to force him to go out.
Bunsen takes a bear to school, and Amanda attempts to provoke the bear in front of everyone. / Bunsen and Mikey come to Amanda's rescue after a number of sneeze beasts came out of Bunsen's nose.
In order to show that bees can spell well, Bunsen gets himself transformed into a bee, enters a spelling bee, and wins it. / Mikey's favorite MMA fighter chooses Bunsen to be his mascot, whereupon Mikey does his best to demonstrate that he, too, is a beast.
As Bunsen and Mikey run across the former's uncle at a museum, they fear that Amanda will see him, and try to help him leave the place secretly. / Mikey buys a body spray so that he could dance with the girl he's sweet on at the prom, but things take a turn when Bunsen ingests the spray.
Mikey informs Bunsen that he will earn a large sum of money from the tooth fairy during teeth losing season, and as Amanda finds out, she grows angry and attempts to prevent this.
As Bunsen and Cosmo celebrate their friendship, Amanda and Mr. Crocker intervene to ruin the day.
Amanda learns that Bunsen is afraid of thunder and lightning, whereupon she attempts to take advantage of the matter. / After getting the hiccups, Bunsen starts to show symptoms of amnesia, and Mikey tries to find a solution.
On Beastgiving, Bunsen goes with Mikey to bring presents to the residents of Muckledunk. / During DST, Bunsen's body clock gets messed up.
On a school camping trip, Bunsen and Darcy try to help Mikey get over the fear he has of forests. / Amanda seeks revenge against Bunsen and Mikey when Miss Flap chooses them to be the new hall monitors instead of Amanda and Beverly.
Bunsen and Mikey go on a field trip to MASA, and they mistakenly travel into space after Commander Cone takes them on a tour of the agency.
Amanda insists on eating Bunsen's beast cookies, whereupon she's transformed into a noisome and fierce beast. / After they realize that minks come every time Amanda says "beast", Bunsen, Mikey, and Amanda decide to make their science project about minks.
Bunsen's hugging chair causes Amanda to be unable to move, and her only chance of getting freed is to be happy. / Bunsen has a crush on a guinea pig and attempts to court her. Amanda, on the other hand, tries to ruin their relationship.
As Mikey has no time to attend all the after-school clubs, Bunsen clones him to have enough time. / Amanda falsely accuses Commander Cone of stealing her phone case when he refuses to give her extra ice cream, whereupon Mikey and Bunsen try to solve the case.
Bunsen receives his Beast Ball, which tells him and Mikey to do some fun activities, whereupon Amanda replaces the Beast Ball with another custom-made counterfeit one. / Mikey wants to take the lead role in the school play to kiss Sophie Sanders, whereupon Amanda intervenes to prevent this.
Bunsen and Mikey assist Amanda in passing the Preparatory Overview of Pupils exam, allowing her to avoid summer school. / Bunsen is given the opportunity to participate in the Muckledunk Mutt Show, but Amanda attempts to make her robot dog the best in show.
Bunsen and Mikey discover a beast toddler in the Monstork Factory, whereupon they try to find his parents. / Bunsen's cousin, Wilda, visits the town and starts catching feelings for Mikey, who gets scared. Meanwhile, Amanda grows jealous of Wilda.
On Bunsen's first Halloween, Mikey wants to teach him how to go trick-or-treating, but as Amanda plots to take everyone's candy, she pretends to be Sweet Teeth, the candy monster.
While Bunsen is enthusiastic about his first Christmas, Amanda discovers that her name is on the naughty list, whereupon she puts Santa in a present box and takes over all the toys.
Following the Best Friends Forever beast ceremony, Amanda befriends Mikey and Bunsen. / Amanda plots against Mikey and Bunsen by sending them on a phony treasure quest and providing them with a forged map to Captain Schnook's Booty.
Amanda tricks Bunsen's dog, Boodles, into going far away from home, whereupon Mikey and Bunsen try to find his whereabouts. / Bunsen's closest pal, Wolfie, pays a visit to Muckledunk, and Bunsen hopes that Wolfie and Mikey would become friends, which scares Mikey.
After Miss Flap modifies the seating chart, Mikey and Bunsen are forced to be away from each other. / As Bunsen sees the toilet water swirling, he falls into a state of trance, so Amanda attempts to make him return to Beast World.
Bunsen swallows Amanda's universal remote, forcing him and Mikey to save her from her smart house after it has become dysfunctional. / Mikey and Bunsen challenge Amanda in order to have their own segment on the local news channel.
As Mikey discovers that Bunsen is about to go into hibernation for 50 years, he tries to save Bunsen by keeping him awake beyond his scheduled hibernation time. / At the "I've So Gotta Have It" store, Mikey and Bunsen embark on an exciting shopping excursion.
Boodles' fur allows Mikey and Bunsen to become invisible so that they can see a horror movie that they are not allowed to watch. / Mikey and Bunsen attempt to assist Commander Cone in finding the job of his dreams.
Mikey is forced to pick between Bunsen and Sophie Sanders, the girl he's sweet on. / Mikey and Bunsen visit Beast World after being chosen as contestants on the Beast TV show Friend or Phony.