I offer a variety of game. Alien simulate activity by spawn of my Alien spaceship in orbit of different planets. The server notifies players of Alien ship arrival. When the ship will be in the orbit of the planet, they start periodically spawn troops-transport on its surface. spawn until they destroy their ship.
On the ship there are several containers with epic weapon they can capture if not destroy the ship. Ship within the same armed and capture it will not be easy.
There is screenshots of Alien cap. Of course, the blueprint will be presented to the admin at the request.