Finn tries to impress Princess Bubblegum with a bubble blower capable of blowing bubbles in different dimensions. Unfortunately, a 4th-dimensional bubble means a black hole.

Children are tested by Bad man to identify parallel and perpendicular edges and faces.

Katherine is invited to solve the algebra problem on the board at school and exceeds her teacher's expectations. The teachers encourage her parents to enroll her in a more challenging school because of her precocious abilities in math.

Numbers 10 and 6 discover the joys of being 16. As the number 16, they impress number 4 as they show all the ways they can be a square.

Number 12 sings about the different shapes and arrays that they can become.