He-Man and She-Ra: A Christmas Special (1985) on Netflix

Plot summary

The royal palace on Eternia is preparing for Adam and Adora's birthday, and Adam is helping Man-At-Arms finish the Sky Spy, a shuttle meant to watch Skeletor. Orko slips inside and fiddles with the controls, and the ship blasts off. Skeletor gives chase in the Collector, and He-Man and She-Ra, unaware that Orko is aboard, punch a hole in his craft, throwing it off course. A spell Orko casts to land the shuttle sends it to Earth instead, where he meets Miguel and Alisha, children who lost their way while fetching their family's Christmas tree and who explain the holiday to him. On Eternia, his spellbook is found near the launch pad, and Man-At-Arms traces the ship to Earth, but the beam that could bring Orko back needs a Carium Water Crystal, and none exists on Eternia.