in an alternative world, the planet Mars is inhabited by a sentient species called the "K'voks". They're slim and tall, and they have technology more advanced than Earth's. Recently, something went wrong in diplomacy, and Mars decided to wage war on Earth.

you are a human soldier, defending a space station. Currently the crew is asleep, and you're keeping an eye on stuff. You make a turn, and there's a K'vok soldier in front of you, holding a large rifle-like weapon. How did they get here??