Dallas Howard has a younger brother called Ricky and was a resident of Gunnison, Colorado, who, in 2004, became involved in the Xenomorph outbreak that ultimately led to the destruction of the town.
He was in prison for burglary. When he returned to his town, he was greeted by Sheriff Morales.He points out to him, that his brother Ricky has problems. When Ricky comes home to find Dallas back from his time in prison, he tells him about Dale and his friends having attacked him and that his car keys are lost in the sewer. He stops Ricky, when he thinks about geting revenge and offers to help Ricky to get his keys back, but only after thoroughly arguing. When the Aliens attack, he and Morales take the teenagers along with Darcy to a radio store where they find a few more refugees; two clerk owners. When Kelly offers an alternative escape plan because she doesn´t trust the army´s intentions, he sides with her, and leads her, her daughter Molly, Ricky, Jesse and Drew to the hospital.
They manage to fly away, but the shockwave from the nuclear explosion causes turbulences, forcing them to crash. Dallas awakes, dazed, to find a group of camouflaged troops surrounding the group. Dallas delivers the gun to them in return for medical help for Ricky.
Only he, his brother, Kelly and his daughter survived the event in Gunnison.