The Enterprise needs to cross a subspace corridor protected by the hostiles Kavalans to arrive on time to the meeting with the Xindi council scheduled by Degra. However, the ship is surprisingly stopped by another Enterprise from the future with the descendants of the original crew-members. Lorian, the captain and son of Trip and T'Pol, explains that the original Enterprise was sent one hundred and seventeen years back in time while escaping from the Kavalans through the corridor, and they want to help the Enterprise to succeed and accomplish her mission at any cost.
"E2" is a flawed episode, where the only explanation for the holes in the screenplay is the Expanse, where the laws of physics and time are different. T'Pol alive and the duplicate Enterprise together with the original T'Pol and Enterprise are absolutely incoherent and I did not like this unnecessary and forgettable episode. My vote is six.
Title (Brazil): "Enterprise 2"