In the mission, in the lair, you need to find and destroy the incubator, but it is nowhere on the map. I can not continue to pass the game, what to do?
If it is a level 1 alien base you need to kill the 2 hatching sentinels. They have jellyfish like caps and crackle with electricity when close.
If it is a level 2 alien base look for this guy. it is a 5x5 structure and tends to spawn in corners and whatnot.