Ever since Weridmagedon, Stan has never been the same. He went through so much and he saved Gravity Falls from Bill Cypher. But, when Stanley's memory and Bill got erased in his mind, there's been a secret that Stanley has been hiding. Bill is still in his mind and sometimes he tries to speak to him, trying to torment his conscious mind. He's trying to keep this a secret so Stanford won't have to erase his mind again that he worked so hard to regain back