Tim O'Brien was a resident of Gunnison, Colorado who became involved in the Xenomorph outbreak that ultimately led to the destruction of the town in 2004.

Tim was killed when a Xenomorph broke into his house; he died attempting to hold the creature off so that his wife Kelly and daughter Molly could escape.


During Kelly's time in the army, it is revealed that he has become Molly's "mother role" during her absence after she rejects her mother's attempt to read her a bed-time story.

He is killed the next night when Molly says that she saw a monster outside her bedroom window. When he looks outside, a Xenomorph attacks him. As he holds it off, he tells Kelly to take Molly and run, which she does. He is unable to overpower it and is killed. Moments later Wolf kills the Xenomorph and dissolves it together with his body with Dissolving Liquid.

Personality and Traits[]

A soft spoken person, Tim seemed be a caring father and a loving husband.




  1. Tim's actor's (Sam Trammell) height is 5ft 8 ½ (174 cm), so that is also how tall Tim would have been.
  2. Shane Salerno (writer), The Brothers Strause (directors). Aliens vs. Predator: Requiem (2007), 20th Century Fox [DVD].
  3. Paul W. S. Anderson (writer and director). Alien vs. Predator (2004), 20th Century Fox [DVD].