He-Man and the Masters of the Universe (1983)

S01E06 The Time Corridor

The Sorceress transports He-Man, Man-At-Arms, Orko, and Battle Cat into the past after Skeletor, accompanied by Tri-Klops and Fang Man, ventures back in time to set a powerful time bomb at the very location of Castle Grayskull. If He-Man fails to thwart their plan, the bomb will obliterate the castle in the present day, putting everything at risk unless he can act swiftly to prevent disaster.