Originally Posted by Donkey-er
been grinding this quite a bit I'm 100% sure I got WAY over 30 guys that don't respawn. I got no clue why it isn't poping... it doesn't have to be done in 1 playtrough, but replaying ch5 and ch6 endlessly doesn't help ether...
Try starting from the chapter you first get the Brainbugs, than play through the game until it pops.
It must be one playthrough
and infinite's do not