While on a special mission, a team of Skylanders discovered a secret lair where Kaos was experimenting with a new discovery - Petrified Darkness - which he intended to use to take over all of Skylands! In the fight to stop Kaos, the lair exploded, releasing a cloud of pure Darkness! The Skylanders knew they could not let it escape, so they absorbed the dark energy, transforming them into dark versions of themselves.