"who was there to protect me, Skyhammer?" an autobot spy that was burned by one of the mercenaries during a battle, he went insane, offlined the commanding officer he was sent to rescue, then joined the mercenaries.
Since the mercs are gonna be the "spooky guys" and I've based a good number of them on tf2 as a joke, why not base them on the only tf2 horror film?