Years -& ;a^fter an alien invasion(! almo=+st <`extingui!=sh ed h,=u.=ma*n )mankind, refuge<#+e on a :<secr+et?]@ ]base on the Moon, three `.$heroes deci\de ; to ju("+mp into! ?a ti/
=me travel in t^)he de+^&sperate[# & at*t(<empt to save the survivo%'rs but they d[on't know that the  ,S#e&)ntinel /-is wa//"