F.C.F. Episode One (That Within‪)‬

Sergeant Troy Black goes on a routine mission, but a betrayal sends him crashing into an ambush, which gets his unit killed and leaves him the sole survivor.

Stranded on a moon, with the military outpost a distance away and his oxygen almost depleted, he needs to find his way back to exact revenge on those who betrayed him, and find out what's going on with the sudden bug infestation.

This all without him losing himself to the many voices in his head.