By Dennis 2/21/2012 10:43:00 AM
At the end of the Fringe episode "A Better Human Being", Nina is caught in a lie, then it is revealed that there is another Nina tied-up somewhere else with the abducted Olivia.
Since we already know that Alt Brandon in the new Red universe was revealed to be a shape shifter, it's possible that one of these Ninas is also a shape shifter - meaning that Massive Dynamic was compromised at very high levels in both universes.
Normally a shape-shifter kills their victim when they assume their identity, but we see that there is another, bound Nina still alive. This could mean either that these Next Generation shape-shifters don't need to kill their victims, or the scarier possibility that both Ninas are shape shifters!
However, there is another possibility, that they are both "real" Ninas, and the fake Nina (Nin-not?) is the Alt-Nina from the Red Universe.
I came up with seven possible combinations - what do you think is going on?