Countdown

The Reptilians kidnapped Hoshi to brainwash her into cracking the weapon's arming codes. Meanwhile, Archer and his new Xindi allies (Arboreals, Primates, and Aquatics) attempt to stop the arming of the superweapon aimed toward Earth, launching a full-scale assault on the device. When the Sphere-Builders see the weapon is about to be destroyed, they cause at least one sphere to emit massive spatial anomalies destroying many ships.

Synopsis adapted from TVmaze (CC BY-SA 4.0)