You can choose to add Godzilla to any game. He isn't an enemy; investigators cannot interact with him. Think of him more as an uncontrollable force of nature. He starts in his Unruly Behavior phase, and every turn you roll a die to determine his actions. He might roar, causing investigators to lose sanity, stomp around, killing enemies and leaving Debris tokens that hinder investigators' movement, or even use his atomic breath to place fire and inflict wounds on all figures in a single zone.
