The Defenders' secret training is interrupted when an earthquake signals that the monstrously evil Megalith is breaking free. Their mentor, Professor Alnar reveals to them that their training will not be completed. They must immediately embark on a dangerous mission to re-imprison the Megalith by recovering the four Pure Stones. Before the Defenders can leave the Dojo and start on their epic quest they are attacked by a vicious Rock Serpent and must face their first full on Di-Gata Battle!

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The Monastery burns as Malco and Flinch tear it apart looking for The Key. With the help of a bizarre creature named Zad, the Defenders sneak into the monastery and split up to find the Key. Meanwhile, Adam runs into the beasts from earlier and requests that they give him back the Nova Stone. They refuse, but he easily defeats them and claims the stone. He arrives at the monastery just in time when Mel is attacked by Flinch on the balcony. He saves her (again) and apologises for lying to her. Seth and Kara find the Elder Priestess of the monastery, who leads them to the Key. Malco and Flinch (who had by then escaped from Adam and Mel) arrives, and Flinch traps them in a force field. Erik finally passes by and knocks out Flinch by slipping a booster stone into his electronic backpack, electrocuting him, then set the others free. Malco challenges them to a fight, which Mel and Adam arrive just in time for. But Malco is too strong, and even the Warrior Hange cannot defeat him.

While travelling with Adam (whom they met in Episode 2) Seth becomes annoyed at him and challenges him to a duel. While they're away, Mel, Eric, and Kara are attacked and defeated by the bounty hunter, Snare.

The Defenders come across a carnival. The circus misfits end up controlling Erik through an amulet. Mel goes to investigate and it turns out that both the circus members and Erik are being controlled by another creature.