Nine-year-old Justin winds up with a magic shaker that he can use to make tons of crazy monsters with awesome powers.

At first, the boy sees the Monster Shakers as a good solution for fulfilling his desires or solving problems. But before long, he finds out the hard way that its magic clashes with reality, creating some pretty tricky situations!
Justin and his older sister Gwen have to work as a team to try and patch up the damage created by the Shaker’s monsters, while keeping the object hidden: this Monster Shaker MUST remain “Top Secret” no matter what!