The Frostians: Martis (Special story)

Thirty Years ago, in a far away planet called Frost and there are three babies born at the same time. The son of the King, the son of a soldier and a son of a lower class warrior. One day three destinies will collide after thirty years and Martis, the son of a soldier will grow into the Mighty warrior.

How Kristian and Kevin will stop the over powered Martis?