Operation Bricktonite

Talk to Doc Devio again after rebuilding his lab to start this quest. There are two hideouts that will have the quest markers. Enter the one nearby first. (Hideout: Society of Evil HQ)

Once inside, you'll encounter the all-familiar fan and fire-trap rooms. In the first area, navigate through these rooms and destroy enemies along the way. You can find a monster-superhero hybrid chest in this area, as well as an ordinary chest, and two dead-end rooms filled with enemies. Make your way to the second area once done looting these chests.

In the second area, repel the enemy ambush and continue to the next room. Overlord Omega will send his goons to ambush you. Defeat them all and the door to the computer room will be opened. Access it to complete the hideout.

Talk to Knight Rat outside the hideout to complete the quest. Now you have to clear the remaining hideouts in the district to clear it.