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

S1E21 The Taking of Grayskull

Orko feels neglected on his birthday when Man-At-Arms brings news of unusual destruction in the town of Becilia. He-Man, Teela, and Ram Man set out to investigate, only to find themselves caught in a tornado that causes some bizarre occurrences, including the disappearance of He-Man's sword due to a mysterious force. Meanwhile, feeling forgotten, Orko visits The Sorceress, only to discover that Castle Grayskull has vanished! Skeletor has captured the castle, along with The Sorceress, using a White Hole to pull it into a strange reverse dimension where he aims to exploit its powers. He-Man, accompanied by Battle Cat and an unwitting Teela, plunges into the White Hole to thwart Skeletor’s latest sinister plan.