In 2200 an alien invasion has begun and is ravaging the world for its resources and technology. In the initial stages of the invasion the attacks seemed to be random, but after they managed to repel a coordinated assault by the combined forces of the worlds armies, scientists theorized that these aliens are in fact organized and calculating. The world pooled its resources and power together to be able to defend the planet from an apocalypse until the worlds best and brightest can come up with a way to beat the overwhelming force of the invaders.
After several months of failed attempts at destroying the aliens, the united worlds government decided to put all focus on building a prototype machine to send one man, with the knowledge of the coming apocalypse and all information they had on the aliens, with every failed and promising idea that the scientists and military attempted and thought of (But didn’t have time to execute) to give the people of the past somewhere to start work and not repeat the same experiment that has failed in the future.
After 10 years, the force of the aliens have managed to overwhelm the human defense force, with only a handful of soldiers and scientists surviving and managing to work on the plan till the very end, locked inside a laboratory. The scientist is making the final calibrations to the machine that will allow them to send someone back in time roughly 100 years to deliver the warning to the people of the past and give them a chance to prepare.
Before the scientist can complete his calibrations of the machine the building becomes under siege, possibly because the aliens have learned of this device that can allow for time travel. The soldiers that are defending the laboratory had barricaded the main doors into the building so that no one could gain entry. A huge explosion, big enough to shake the building and cause the structural integrity to become compromised, after the explosion it the building began to creak and collapse.
In the panic the building collides with another building propping it up for a short while, after collecting their wits they look back at the device and see that it has been damaged by a piece of falling debris.
The scientist is advised not to activate the machine as they do not know how bad the damage is and what effects it may now have, against the advisement of everyone the leader of the soldiers decides to activate the machine (Knowing that it is their only hope of stopping this invasion and preventing the extinction of their people)
Before the device is able to build up enough power to transport the messenger, the aliens burst into the room shooting their weapons, the messenger takes a shot to the face and is instantly killed, another soldier takes a shot in the chest while protecting her leader, then as more of the aliens enter the room the machine lets out an aura that envelops everyone in the room and begins to spark.
The machine activates successfully but has incurred a slight malfunction due to the damage sustained by the debris and sends everyone in the room (Not just the 1 person like it was meant to) back in time. The calibrations where knocked in the initial explosion and has sent the people in the room too far back, instead of making a 100 year jump, they traveled back 1000 years along with 5 of the aliens, knowing that if these aliens where to remain alive in this time the humans would have no way to defend themselves and would surely be overthrown, defeating the objective of traveling through time to deliver a warning.
The remaining 4 Soldiers and 1 Scientist will have to engage and defeat these aliens if they are to stick to the plan and save the world like they set out to do in the first place.