Tired of sharing a room with her siblings, One gets her wish when the monsters' estranged uncle comes over and offers to swap his mansion for the monsters' home. At first, it seems that having a new home is great, but when the monsters didn't like having their own rooms, they decide to find their mom and want to tell her that they want to switch homes again. During their journey to find Mom, they fell down the laundry chute, entered a hall of mirrors, a large bathroom, got sucked into the air tunnels, entered a room where the stairway are upside down, a room with a trampoline and finally both encountered and chased by large orange cat but near escaping it, they decide to head back to their house and asked their uncle to switch back, but it was revealed that he was actually their mother in disguise and the mansion they lived in was only rented for one day.