"Saturday Night Massacre" - Sunday, Aug. 3, at 10 p.m. (ET/PT)
Lexi emerges more powerful and ruthless than ever. Tom and the 2nd Mass must work together with the Volm to hold off the invading Espheni forces in what becomes the bloodiest battle of the series. Mira Sorvino, Treva Etienne and Robert Sean Leonard guest-star.
Directed by Olatunde Osunsanmi
Written by David Weddle & Bradley Thompson
Created by Robert Rodat