The Spirit of Grayskull first appears in the first wave of Masters of the Universe Minicomics as a skull-shaped cloud of smoke that emerges from Castle Grayskull and speaks to the Heroic Warriors as thye voice of the castle itself.

The Spirit of Grayskull also appears in a Filmation episode as a disembodied head who talks with The Sorceress of Castle Grayskull.

A translucent King Grayskull figure was sold as the Spirit of Grayskull for Masters of the Universe Classics, thus defining the Spirit of Grayskull as King Grayskull's spirit.

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