Welcome Back(Depravity Falls)

Dipper's been having visions. Terrifying ones. Ones that distort his world to the point where he can't tell reality from his dreams. He thinks his sister is evil. He thinks his Grunkle Stan is dead. He doesn't know what to do anymore. He doesn't know who to trust.

Mabel is afraid. She's found a demon living in her mirror, and evil version of herself that threatens to destroy anything and everything. She doesn't know how long she can hold up this way. If anything gets out of hand with this demon, she could be responsible for the death of everything she loves. But that's exactly what happened.