Zero Hour

Archer tries to coax a traumatized Hoshi into using her decryption skills to disable the Xindi doomsday weapon before the Reptilians can use it to destroy Earth. Archer risks his life in a dangerous gambit to intercept the superweapon, sneak by the Xindi Reptilians aboard, and disarm it from inside. Meanwhile, the Enterprise embarks on its own desperate mission to cripple the rest of the spheres.

Synopsis adapted from TVmaze (CC BY-SA 4.0)