Alex Kralie (Marble Hornets)

Alex was originally described as being enthusiastic and rapturous, though the videos from the Marble Hornets filming in 2006 display his descent into madness, paranoia, anger and other forms of psychosis. After being stalked by The Operator, it is shown that he is very brutal, violent, and aggressive, incapacitating several of his friends in various videos, including Tim, Brian, and Jay. It can be assumed that he killed Seth and Sarah as well, and it is revealed later in the series that he even killed his girlfriend Amy after she came into contact with the Operator. His violence is shown in great detail when he assaults and murders a man outside the tunnel. Alex was the director for the student film Marble Hornets. Early on, the series focuses on the tapes that Alex gave Jay and the mental breakdown that occurs during the time he worked on the film, with Jay adding comments and notes about the content. However, even though the videos have shifted to centring on Jay and his dilemmas, Alex is still a very prominent character.

He first comes into contact with the Operator while filming Marble Hornets. This makes him very paranoid and he begins to film himself at almost all times, even while he is sleeping. The tapes begin exhibiting strange occurrences including Operator sightings and irritable behavior from Alex which Jay says he has never seen before. Jay suspects he has been messing with the audio in the tapes.

Alex has also shown to exhibit behavior similar to a proxy, although it is confirmed that he is not one. After his descent into madness, he has repeatedly been linked with the appearance of the Operator, such as calling Jay shortly before the Operator shows up, and remaining inside when the Operator shows up in his house, after telling Amy to jump out of the window. Alex Kralie is described as a person of average height and build, typically seen wearing normal, everyday clothing such as a T-shirt, jeans, and a jacket, though sometimes he is shown to be wearing a work shirt with sleeves rolled up.