The plan is nearly derailed by a mole within the resistance who alerts the Espheni. However, Tom uses a decoy team to lure the enemy away while a smaller group successfully infiltrates and destroys the reactor. Character Arcs:

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.

While "Collateral Damage" is a common title, these are notable episodes from other major series: "Falling Skies" Collateral Damage (TV Episode 2013) - IMDb

Struggles with intense nightmares and a potential mind probe involving his relationship with the alien collaborator Karen.

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