Mark is being made a fool. If it wasn’t for his bleeding heart stupid friends getting in the way, he would have figured it out. He was asking the right questions of this “Seance Dog”

That is ShapeSmith. The Creepy Dude that was hanging around the Guardians. When he was telling his “backstory” to them it kept showing flashbacks to a devastated martian colony. It was implied that ShapeSmith was the “infected astronaut” in those flashbacks. Mark had the guy on the right questions, the shapeshifter even admitted to manipulation when mark asked “Why did you take form of Seance Dog?”. Its clear that the “ShapeSmith” was stalking mark because he saw him save Seance Dog from the trash. However ShapeSmith is oblivious to context (mark first night at college) and shows up as his childhood toy. ShapeSmith is obvious that he is focused only on his one goal… speading alien horror and he’s looking for the strongest vector to carry it out across the galaxy. Mark is being played. That is NOT OMNI MAN. They are going to mentally dope-a-rope Mark and I am absolutely terrified what is going to happen to him.