A galactic armada of some nondescript Alien species(which is my way of saying I haven't thought of one yet)descends upon our planet. Uniting the forces of the world against their common foe, as we rise up to face the Alien menace.
We find that we are hopelessly outmatched, destruction and despair engulf the world. The purge begins, one by one the valiant armies of the Earth fall against the relentless crush of our superior enemy. The world population dwindles, the once mighty Earth armies are scattered around the Earth in small militant groups desperate to maintain survival.
Whittled down to small rebel contingents the remaining survivors battle on, launching valiant attack after valiant attack on the oppressors. Their success and accumulation of the alien technology makes their attempts more and more effective.
However against a seemingly limitless force and with no coordination their attacks are futile.
Then, from the ashes of misery, comes a leader who guides the remaining humans onto victory after consecutive victory. Forming a cooperative network of the remaining rebel forces. They launch well planned and calculated assaults on their foe. Due to their small numbers the rebel forces prove difficult to wipe out entirely.
Though growing suspicious of the rebels' organisation they guess they must have a link, a means of effective and secretive communication, with some form of permanent HQ from which to stem their attacks.
Their base of operations discovered, the rebel forces are hunted down.
The defenders, battling courageously hold off their adversary, countless misshapen pieces of flesh line the entrances, the once desolate passageways now filled with the remainder of the dead.
Beads of water drip down the faces of the remnants of humanities final hope. Crimson gashes riddle their bodies, their faces made of stone, determination etched into the rock. No tear at what will be their last hour is shed, just pride that they fought to the last.
The beats on the metal flooring of the corridor leading to the control room where they make their final stand grow louder and more frequent.
The lasers sights are activated, the power cells charged as the last of a proud race face their end.
They fight to a man, the leader crouches, his fingers digging into his hip in a vice like grip, red liquid flowing like a river bocked loosely by boulder. His eyes are an inferno, as they burn into the faceless creatures looming ominously over him.
One steps forward and utters sounds in a language that can loosely be translated as:
"You have lost, human'
The man, looks long at hard at what will be the last sight he sees, he recalls an ancient film he had seen. And in his raspy, determined croak says
'I warn you, I'm a screamer'
He pushes all the strength left in him on the button his hand rests upon and the Earth explodes.
And that would be my perfect end to the world.