This episode is one of those episodes barely making it watchable. A low-rank military has lost his arms and legs in combat and commit homocides by letting his astral body take out whole familys belonging to his superior officers. When the superior officers don't want to continue their lifes they decide to commit suicide but are on and on in various ways hindered in their action to do so.
Mulder is, as usual, quick to come the right conclusion and has already a hunch what is going on. The conclusion finally he withdraws from x-ray plates (the ones dentists uses) he has been carying around the whole time while staying in the military hospital where the episode mainly takes place.