Steven Gibbons was a member of the Gibbons family. When the bombs fell, the members of the Gibbons family who were at home at the time locked themselves in their bunker, where they became trapped after the machinery controlling the door was broken. Locked in together with his mother Victoria, grandfather Frederick and his father Patrick, he can be found and fought if the player character fixes the machinery and opens the bunker door.
Missing from the bunker is his sister Eliza Gibbons who was off to a Halloween party when the bombs fell. Nathaniel Gibbons, his brother, went missing before the bombs fell, though it was not uncommon for him to be gone a lot.