Lt. Hollister is an ally with a faction of Nemesis. He will help you as he believes you are... other. He can be met during the Automatic Villainy story arc from Technician Naylor, during the second mission: Impersonate yourself and steal from the Nemesis Army. He had slightly less hit points that a Lieutenant of the same level, which probably means he has a category of Boss (unless you are soloing at Villanous level). Once free, he will attack any Devouring Earth beings in his aggro range. I have no idea what happens if he's killed.