Enter Sandman

S1 E6: When June's friends and family becomes increasingly more exhausted, June enters the Dream Realm and discovers they are being enslaved by a upper crust demon (the Sandman) to build a giant skyscraper into the waking world (so he can rule that as well). After checking out her various friends' wacko dreams, June battles the demon. The fight ends with a wild chase through various dreams in various locales.