Revolution

Talk to Stanley Screamer again to start this quest. Follow the marker and find Doc's Mad Lab hideout, a few steps away from Stanley. Enter it and you'll have to destroy Omega's Undead Goon and access the hideout's computer.

Once inside, follow the straightforward path across different trapped rooms and several enemies. You'll eventually reach the stairs leading to the next area.

The next area has a path that leads to a large room with a single chest in the middle. Like the others you have encountered before, you have to defeat all the spawned enemies to lower the spikes and loot the chest.

Continue forth until you reach the large room where you'll fight several waves of enemies. Upon defeating them, a “monster” chest will appear. Loot it and continue forth to the next area.

Destroy the objects in the first room to get more blocks then continue to the boss room. Here, you'll fight the Zombinozor once and for all. Like last time, use a ranged character to “kite” the boss with projectiles while running around. Fighting this boss up close is a bad idea since it can release a large pool of toxic goo, similar to Rotten Walker's ability. The boss also heals itself up so keeping distance and maintaining small but steady damage is a better option.

After defeating the boss, access the computer to complete the hideout. Once outside, talk to Stanley to complete the quest.