In the starting areas, Galaxy City, and Atlas Park, I really hate it when the creeps run from my characters, toward the Police Drones, and let the Police Drones take them back to The Zig! In those areas, I discovered a neat trick. If you have a creep that just runs around aggroing other mobs, instead of toward the Police Drones, just wait for the creeps to walk back, then take them out. If they run away again, aggroing more mobs, just wait until they come back, then finish them off.