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THE STORY:                      
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The government, in it's infinite wisdom, reopened the Mars project. The same
tired old assurances given by the same tired old politicians ring hollow.
"This time its different", they said. "We will no longer teleport in space.
Instead, we will teleport in time." 
 
Right. As if that made any damn difference. 
 
As the boundaries of time were broken down by earth's best scientists the
children of Hell eyed a new way into man's domain. Not long after the first
successful experiments, the first deformed shape stepped out from the
spinning blue void of the time gate. 
 
History's worst nightmare revisited; demonic invasion. 
 
This is why you exist. A warrior, bred for combat, ready to trade your life
for earth's safety. You and your comrades have at least learned from your
superiors' catastrophic past endeavors. And so you fought, and were
repelling the invasion once more. 
 
Or so it seemed... 
 
Alas, Hell had also gained wisdom from the last war. Now, while the marines
are slaughtering and being slaughtered, the rulers of hell use the captured
time gate to slip into earth's past. If they can't defeat the humans of the
presence, then at least their medieval ancestors will be easy prey... 
 
Earth's past is about to be shaped by demons... 
 
Your platoon's briefing is simple, your mission suicidal: 
Use stealth and firepower to infiltrate the time gate complex. You will
deploy a set of teleporters to get as close as possible to the infected gate.
Still, several hell-spawn strongholds will be between you and the time-rift.
When you have secured the gate, follow the demons into the vortex, back to
the dark ages. Of what awaits you there little is known, other than this: 
 
This is not just a deadly threat to the billions currently populating earth.
It is much more; All previous generations will perish if Hell wins our past.
The word "human" will be eradicated from existence! 
 
If you fail to destroy all of Hell's strongholds and eradicate all demons
you need not look for a way back home; 
 
There will be hell to pay... 
 
 
 
(of course something goes wrong with the teleporters and only you come out   
alive on the other side, pistol in hand ;)