Dragons have now become a legend for the world. After the occurrence of a crack in the surface of the Earth, scientists go to study it. Soon a group of kids discover the dragons are hiding and they decide to hide them.

Supernatural/Horror set against the backdrop of Bangkok, Thailand. After a high-speed police chase leads to an unexpected crash, two American bank robbers and their three local hostages take shelter in a mysterious manor in the woods. As the criminals plot their next move and the hostages try to escape, they begin to realize no one is safe from the evil lurking inside the house.

All Clara (Mackenzie Foy) wants is a key, a one-of-a-kind key that will unlock a box that holds a priceless gift from her late mother. A golden thread, presented to her at godfather Drosselmeyer's (Morgan Freeman's) annual holiday party, leads her to the coveted key which promptly disappears into a strange and mysterious parallel world. It's there that Clara encounters a soldier named Phillip (Jayden Fowora-Knight), a gang of mice, and the regents who preside over three Realms: Land of Snowflakes, Land of Flowers, and Land of Sweets. Clara and Phillip must brave the ominous Fourth Realm, home to the tyrant Mother Ginger (Dame Helen Mirren), to retrieve Clara's key and hopefully return harmony to the unstable world.

The movie picks up right after Scorpion's Revenge where the heroes are attacked by Shao Kahn, which will force "Raiden and his group of warriors into a deal to compete in a final Mortal Kombat that will determine the fate of the realms." This forces the good guys to travel to Outworld defend Earthrealm while Scorpion journeys to find the Kamidogu (a mystic relic made by the almighty Elder Gods) before it is used to bring back the mysterious One Being, who would destroy the universe.