.
Since the beggining of the series, Brian is missing. We only see footage of him back from 2006, when he was making Marble Hornets
In Entry 7 Alex feeds Brian Tim's lines as they sit in an car in an alley, with another passenger believed to be in the back seat. (Alex's 2006 footage)
In Entry 12 Alex and Brian film a walking shot, as a female pans the camera. The Operator is in the background, thus seeming to be the first time Brian encounters the Operator, although the tape ends with Alex approaching the Operator. (Alex's 2006 footage)
In Jay's interview with Tim in Entry 15, we learned that Brian lived near Alex and was the one who introduced Alex and Tim to each other. That interview also revealed that, like Alex, Brian has not been seen in some time. Tim also says that he was close friends with Brian and that he didn't know Alex before the shoot.
After seeing Advocate, Jay decided he needed to find Brian, and received an anonymous tip that he could find him at the house.
In Entry 16 he goes to the house. Brian was never seen there, though later entries heavily supported the identification of the house as being Brian's.
In Entry 17 Jay feeds Tim Brian's lines, Brian is said to be getting snacks at the time.
In Entry 18 Jay returns to the house that is said to be Brian's.
Alex said in Entry 20, "So we're here on the set of Marble Hornets at Brian's house. Brian is somewhere; I don't know where…" He is also mentioned to be missing in Entries 17 and 22. (Alex's 2006 footage)
In Entry 22 Brian is one of the people Alex lists as "gone". (Alex's 2006 footage)
In Entry 23 Jay returns in daytime to [[[the house]] which is speculated to be Brian's (Entry 20 above shows the house as it was before in 2006, it is unconfirmed so far whether they are the same place or a later location of Brian's)
In Entry 51, we see Brian again, He and Alex go to a burned down school to film some of Marble Hornets. The Operator shows up and seemingly attacks them. Brian wakes up to find Alex missing; he grabs the camera and searchs the building while shouting his name. He finds Tim laying on the ground, coughing and covered with a blanket. The Operator shows up again, there's some distortion in the video, and the next thing we see is suposedly Brian's legs being dragged out of the room. Someone picks the camera and leaves the abandoned building. Due to the events of Entry 29, we assume the person dragging Brian's legs and picking the camera up is Alex. (Alex's 2006 footage)
In Entry 55 Tim, Alex and Brian film transition scenes and discuss going to an abandoned Hospital near Tim's home town. (Tim's Tapes)
In Entry 56 Brian is mentioned to be coming the next day for filming. (Tim's Tapes)
In Entry 84 Tim shows the footage from back when Alex was casting actor for the movie, the first one is Brian. Tim notes that Brian was wearing a hood similar to the hooded man
In Entry 86 Alex shows Tim the dead body of Brian dressed as the hooded man.
