Quake II

Humanity wages an existential struggle against the Strogg, a relentless civilization of biomechanical warriors bent on assimilating all life into their grotesque war machine. Desperate to break the stalemate, Earth's military commits to an audacious invasion of the Strogg homeworld itself, but the landing quickly turns catastrophic. A single marine regains consciousness amid the wreckage, finding himself isolated within an alien metropolis teeming with converted soldiers and industrial horrors. Stripped of backup and surrounded by enemies, he must navigate the enemy's vast mechanical stronghold, dismantling installations and sabotaging the Strogg's ability to wage further war.