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The Guardians of Eternal Youth's Realm was seen in "Free Cake" and "Fists of Justice". It is where the Guardians of Eternal Youth live. Skips was brought there when Mordecai and Rigby interrupted his spirit youth dance. Then, in "Fists of Justice", Mordecai and Rigby battle the evil Klorgbane here.
The realm appears as a glowing castle with a few thrones at the top of some stairs on a glowing island in space.