When Dez makes a wish on himself in a mirror, he causes dimensions to collide. First, doppelgangers of Dez, Puffin, and Akiko arrive. (With the new Dez being slightly taller because of Dez's wish.) And they all get along famously. But Fireball Cat reveals to them that the dimensions will destroy the planet. They have to uncollide, and fast. They need mirrors! When the house of mirrors smashes into itself, the gang needs to find another one. But not before they rescue two runaway roller coasters.