On March 10th, 20XX, we had a fateful encounter with aliens of another universe. Apparently, they were exploring the Milky Way on vacation and stumbled upon our beautiful blue planet. They met with world leaders who were eager to meet and eventually came to an agreement to combine forces. We shared our technology with them and they shared their's with us. However, they quickly came to realize how inferior human technology was when compared to that of their own. According to the accounts of two humans, the aliens were caught planning a meeting to overthrow the human race in an underground headquarters. The news spread like wildfire, and the world's leaders began to condemn all aliens to the ground. Now, your job is to make sure they stay underground. Good luck, soldier.
Dare to disrupt their plan!