A dream demon. We were dealing with him all summer. He helped this kid, Gideon, try to steal the deed to Mystery Shack out of my uncle's mind and kiiiiiind of possessed me to try and steal my uncle's journal. [ BUT THAT IS A STORY FOR ANOTHER TIME. It's still a little embarrassing how Bill was able to trick him, even if they had defeated him in the end. ] We didn't realize what a threat he was until Ford came out of the portal, though. Activating the portal created an interdimensional rift in space-time, and while Ford was able to contain it, Bill wanted it so he could break free from his dimension into ours.