Operation Alien Overlord has 4 key objectives that Bitterman must complete over the course of the game. He finds himself many miles from the Big Gun in a Strogg base on the outskirts of the city. Most of the Marines are captured or killed, but Bitterman is one of the lucky few to survive. This causes most of the pods to crash land (many miles from their target landing zones). During the first attack on Stroggos, the Big Gun strikes down most of the Marine pods with a powerful EMP blast. During the single player campaign, you take the role of a Marine called Bitterman, taking part in " Operation Alien Overlord", attempting to save Earth from the Strogg invasion by counter-attacking their planet, Stroggos. Quake II takes place in a futuristic sci-fi environment. Three Quake II logos are shown above the entrance to the Makron's palace, suggesting that the logo is somehow of importance to the Strogg.