Mikey and Bunsen have to deliver a beast baby after accidentally switching packages at the monstork factory; Bunsen's cousin Wilda comes to town and develops a crush on Mikey, which terrifies him and makes Amanda jealous.
Mikey and Bunsen help Amanda pass the Preparatory Overview Of Pupils test so she can avoid summer school; Mikey enters Bunsen into the Muckledunk Mutt Show, but Amanda tries to sabotage them and win with her robot dog.
Bunsen's beast ball tells him and Mikey to do fun things, until Amanda swaps out the ball for one of her own; Mikey wants the lead role in a play so he can get a kiss from Sophie Sanders, but Amanda plans to sabotage his chances.
To make time for their band, Bunsen clones Mikey so his clones can run all of his after school clubs; Mikey and Bunsen go into detective mode after Commander Cone is framed for stealing Amanda's phone case.
Amanda gets trapped in Bunsen's hugging chair and can only be released once she is happy; Bunsen falls in love with a guinea pig and tries to woo her, while Amanda tries to sabotage the love affair.
Amanda turns into a ferocious beast and causes panic at school after eating Bunsen's beast cookies; Mikey, Bunsen and Amanda team up to study minks after Amanda's tightened braces cause her to make mink calls.
Bunsen tries to help Mikey overcome his fear of the woods during an overnight camping trip; Amanda tries to sabotage Mikey and Bunsen after they get appointed as the new hall monitors.
Bunsen attends his first day of human middle school in hopes of proving that beasts and humans can happily co-exist; Bunsen literally loses his head on picture day and Mikey has to help him find it before picture time.
Bunsen is excited to take Mikey to Dimmsdale to meet Cosmo on their Friend-iversary, but trouble arises when Amanda secretly follows them.
Mikey explains that Bunsen will be richer than Amanda after the tooth fairy leaves him money for all the teeth he loses during teeth losing season, so Amanda vows to capture the tooth fairy.
Bunsen, Mikey and Amanda play the beast version of hide-and-go-seek in Bunsen's house; Bunsen's love of ice cream almost gets him expelled when Amanda uses it to lure him out of school.
After discovering Bunsen's uncle in a museum, Bunsen and Mikey try to sneak him out before Amanda catches them; after Bunsen sprays himself with fancy body spray, he transforms into a hunk and becomes Amanda's desire.
Bunsen proves bees are the best spellers when he turns into one and wins the spelling bee; an MMA fighter picks Bunsen to be his new mascot, so Mikey tries to prove that he is a beast too.
Amanda tries to get Bunsen kicked out of school when he brings a dangerous bear to class; Bunsen and Mikey must save Amanda from mischievous sneeze beasts that escape from Bunsen's nose.