Troy Mittleider

Jack and Walker arrive at the scene, and he begins to suspect that something is wrong. Galvez is tracked to a building, and the FBI surrounds it. Galvez lures the agents inside and causes an explosion that inflicts massive casualty.

Swift action is taken when the team learns that a former Marine and expert sniper with connections to the leader of an extremist group has escaped from a veterans' hospital. The case brings back memories of Kensi's sharpshooting days.

Archer, Reed and Hoshi are exposed to a highly contagious virus that transforms their bodies, minds and memories into those of long-extinct aliens from a tropical world.

Following a revelation about the fate of the colony, the Bowman family must make an impossible choice.