In the He-Man and She-Ra Christmas Special it's heavily suggested that it is the power of the Christmas spirit that made Skeletor have a change of heart and act in kindness, but I'd argue that it's actually the power of stumbling upon an affectionately clingy tiny creature who decides to get attached to you that is the real culprit.

Screenshot of Skeletor from the He-Man cartoon, holding a tiny, dog-like alien creature who is wearing an orange onesie, and orange open faced balaclava from which its ears that resemble bat wings are popping out, and little orange boots. The alien puppy is looking lovingly towards Skeletor who is smiling in contentment.
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