Bea has a girl sleepover party and Milo and Oscar feel left out, so attend the party as Milina and Oscerlisabeth. Chelsea and Bea let the other girls know that they are Milo and Oscar. But instead of confronting them, the girls then make them do what girls really do on sleepover parties.

Milo ventures out of the fish tank alone, so Bea and Oscar follow him. The three best friends catch the eye of the pet store cat Wilfred, and Milo must put aside his differences with the others to save the day.

Bea is friends with everyone except Albert, who doesn't like her. Bea takes it upon herself to get him to be friends with her at any cost.

Milo does not have any money, unlike Oscar and Bea. They tell him to work but he is lazy and stubborn so he loans money from Randy Pincherson and then Randy treats him he is going to pinch Milo because he used up all the loan. Oscar and Bea give their money to Randy and become very angry with Milo, abandoning him as a friend. Milo decides to work but at the job, he thinks it is very hard just to put the cash into the register. He has the money for the tickets to a concert and the money he owes to Oscar and Bea.

When Principal Stickler says that the boys would build a float and the girls will build another, It becomes a fight because Milo did not come up with a plan and plans one of the boys to spy on them. When the boys and the girls show tier floats, it collapses and becomes a Principal Stickler Float.

Milo entertains holding onto Bud's ear with a fishing pole attached to the end of a plunger, but then shoots into the pocket of his shirt. Milo now runs the risk of becoming dehydrated.

Milo sees a horror movie and thinks fish brain parasits are infecting everyone.

When Pamela Hamster visits Milo in Freshwater High, Oscar and Bea are in trouble.

Milo and Oscar dress as the school's mascot, but when the fame-happy Milo exposes them, not only does he embaress his shy brother, but players from a rival school kidnap Oscar to destroy Freshwater High's moral for the championship.

Oscar's impression of the Queen of Fish England is so similar that even Mr. Mussel's, who is a big admirer of the Queen, cannot tell the difference. The gang goes along with the ruse, until Oscar is mistaken for the Queen by a bridal party and swept away to "his" royal wedding. The day then escalates into a "Slow Jams Rap Battle" between Milo and Mr. Mussels to win the hand of the fair Oscar.