Voltron Force (2011)

S1E34 Masks of Power

While investigating an old temple, Prince Adam and He-Man discover the Masks of Power, which hold the spirits of a long-forgotten evil race. Ambitious intruders snatch the masks and become possessed by the spirits trapped inside. They head to Snake Mountain to present their allegiance to Skeletor, who agrees to take them on—but only after they complete a challenging series of trials. One of these trials requires them to retrieve the Sword of the Ancients from the depths of Snake Mountain.