Grimm Avengers starts during a war between good and evil that takes place in the kingdom. The evil Rumpelstiltskin as Snow White needs to open a portal that can transport it to the real world. His plan is to use their powers in the real world to take control of them and enslave all men. Snow White has no choice and open the portal, but then tried to prevent Rumpelstiltskin to cross over and pulls him through this portal. Little Red Riding Hood and the wolf also pass through the portal, and they learn about what happened, the other three princesses of the kingdom, Rapunzel, Cinderella and Sleeping Beauty pass also through the portal to stop Rumpelstiltskin to bring the plan to the end .