Digimon Frontier

Five kids get mysterious texts on their phones, leading them to a train that takes them to the Digital World-a strange place full of odd creatures called Digimon. They’ve been sent there to stop an evil Digimon named Cherubimon from wiping out the planet’s inhabitants. To do this, they need to find their "spirits," which will let them evolve into the Legendary Warrior Digimon. But Cherubimon has sent his minions to stop them, and the kids soon find themselves fighting his forces to save the world.