SG-1 are asked by the Tok'ra to rescue a creature known as Mujina. The last of its species, Mujina is devoid of face or form and draws its substance from the needs of those around it. The creature is an archetype - a hero for all, a villain for all, depending upon whose influence it falls under. And the Goa'uld Apophis, understanding the potential for havoc Mujina offers, has set his heart on possessing the creature.