The Resistance: Avalon pits the forces of Good and Evil in a battle to control civilizations future. Arthur represents the future of Britain, a promise of honor and prosperity, hide among his brave warriors are Mordred's unscrupulous minions. These forces of evil are few in number but have knowledge of each other and stay hidden from all but one of Arthur's servants. Merlin alone knows the agents of evil, but he speaks of this only in riddles. If his true identity is found all will be lost.
The Resistance: Avalon is a standalone game, and while The Resistance is not needed to play, the games are compatible and can be combined.