Archer and his new allies among the Xindi Council attempt a full-scale assault on the superweapon being deployed toward Earth by the rebellious Reptilians and Insectoids, before a kidnapped and brainwashed Hoshi can decrypt the weapon's encoded arming mechanism and unleash its devastating power. Meanwhile, T'Pol and Trip hatch a plan to destroy a Sphere which they believe will disrupt the entire network of Spheres responsible for the Expanse's spatial anomalies, bringing the transdimensional "Sphere-Builders" directly into the fray.
