GM Diaries #4: An interstellar scheme

The aliens open fire on the heroes, who are barely able to stand against the first barrage of fire, the heavy plasma cannon each squad has nearly breaking their armor and resolve. Luckily, the artillerymen are taken out quickly, ending the effective threat. At the same time, the black hole alien tangles with the AI of the alien ship, using his control of energy pulses to manipulate the AI's programming. Managing to force the ship's door open, he destroys the computer core that houses the AI.

From his connection with the ship, he realizes that the aliens are being controlled by the nanobot upgrades they've been providing, their brains literally tied into the network that the AI ran on. The genie turns into Doctor who, configuring his sonic screwdriver to attack the nanobots directly, forcing them to shut down and disintegrate.

By interrogating the aliens, along with the two humans who had been doing the upgrade procedures, they found out that the aliens had been controlled by an entity called The Resonance, a sentient computer virus that had seized control of their world after "nano-upgrades" became popular. The humans revealed that the aliens had found earth and set up this whole infiltration plan after coming into contact with Kruger, the man who stole humanity's first starship. The man who sold the world.