A terrible earthquake, created by Skeletor, carves a gorge all the way from Snake Mountain to the royal palace. Skeletor knows that the shadow from an eclipse will grant the power to rule Eternia to whoever has control of the palace when darkness falls. On the way there Skeletor and his minions trap Prince Adam. They slip into the palace which has been evacuated while engineers check for damage. Realising the peril created by the eclipse, Man‑at‑Arms leads an ill-fated assault to seize the building. Orko helps Adam, who then turns into He‑Man, joins the fray and retakes the palace.