As Enterprise investigates sabotage, the crew continues their search for Dr. Phlox.
T’Pau and T'Pol's mother, both Syrrannites, assist Archer and T’Pol search for the Kir'Shara and uncover the truth behind the terrorist attack.
As the Enterprise crew unwinds following the completion of their stressful Xindi mission. T’Pol and Trip visit Vulcan where she grapples with making a difficult decision.
4-18: In a Mirror, Darkly
In the mirror universe, a radically different Enterprise crew searches for the technologically-superior U.S.S Defiant, trapped from our universe.