The Forgotten

Archer persuades Xindi weapon-designer, Degra, to examine evidence of the plot to pit the Xindi against Earth to prove humanity is not his enemy. When Archer demonstrates they've been manipulated, Degra offers to attempt to delay the launch of their superweapon. Meanwhile, the crew mourns their lost mates, with Trip still coming to terms with his sister's death and wrestling with the recent death of a subordinate.

Synopsis adapted from TVmaze (CC BY-SA 4.0)