Resident Evil Operation Raccoon City Walkthrough: Gone Rogue Part 4: Parasite Attack

After you watch the parasite infect the zombie on the other side of the laboratory glass, head forward down the small walkway, towards the room where the zombie was taken control of. Head inside of the lab, but don’t worry about the parasite. It will be gone for now, although you will have to fight several of them off later. Inside of the lab you will find Intel and ammo. Grab them and exit the lab.

You will have to find several Keycards in this section, in addition to the parasite and the syringe that you are supposed to inject Nemesis with. Climb down the stairs outside of the lab to reach the middle level of the lab. Turn to the right to find the Blue Keycard on a table surrounded by ominous-looking machines. Grab it and head back up to the top level. Turn to the right. You will find the locked door here. Loot a Grenade Launcher from the weapons locker inside of the room and head back down the stairs to the middle level of the lab. You will find a group of zombies penned in by a laser fence awaiting some cruel experiment. Let your teammates kill them before you proceed to your objective. Activate the switch on the wall to the left of the last pen. This will deactivate the lasers, so any zombies left inside will rush out to attack you. Let your teammates deal with them; you don’t want to waste Grenade Launcher ammo on enemies who are essentially harmless anyway.

Search inside of the pen right next to the switch to find the syringe sitting on a gurney. Now, you just need to extract the parasite from the Tyrant subject sitting on the table and deliver it to Nemesis. One pen will still have lasers active on either side of it, but not on the front. Head to this pen to find Tyrant lying down on a gurney. Approach him and hit A/X to extract the parasite from him. Of course, as you do this, a group of parasites and parasite zombies will crawl out from the small vents on either side of the hall and attack your squad. Aim for the lone parasites first; if they manage to climb onto an unmanned zombie’s head, they will become much more powerful. Don’t use your Grenade Launcher just yet, either. Instead, switch to your Pistol and go for headshots. Shooting the parasites off of the host zombie will kill both the parasite and the zombie. Loop around the area and eliminate all of the enemies before continuing.