I was looking through the episode guide for Star Trek: Deep Space Nine, and came across this:
'A Dominion operative (a Changeling taking the shape of a Federation officer) attempts to trick the Federation into a devastating war with the Tzenkethi. Though that conflict was averted, the Changeling's dying words foreshadow the war to come: "You're too late. We're everywhere."'
I was thinking that the M2 level name might be a reference to this episode, broadcast on 06/19/95. Even as we were helping Blake's men capture their new HQ, Pfhor simulacrums were infiltrating their ranks. Scary, no?