In this episode, the resistance continues its struggle against the Espheni invaders with the help of their new alien allies, the Volm.
At the end of the episode, Maggie finds Hal sleepwalking into the woods, seemingly in a trance controlled by the enemy. Other Shows with "Collateral Damage" Episodes
The Volm identify a nuclear power plant that provides fuel to Espheni weapons and Mechs. Tom Mason enlists an agoraphobic nuclear specialist, Dr. Roger Kadar (played by Robert Sean Leonard), to help destroy the facility without causing a radiation leak.
Struggles with intense nightmares and a potential mind probe involving his relationship with the alien collaborator Karen.
While "Collateral Damage" is a common title, these are notable episodes from other major series: "Falling Skies" Collateral Damage (TV Episode 2013) - IMDb
Below is a feature breakdown of that episode, along with a few other shows that share the same title (though different season/episode numbers).