This week marked the 100th episode of Pretty Little Liars, and after we finished celebrating the benchmark with 100 of our favorite facial expressions, it was time to get to business. The episode had quite a few bombs to drop, but the biggest and most obvious one is that "A" is back. This, of course, leads us back to the one lingering question that's been plaguing us since season one: who is "A"? With so many levels to the mystery, we're doing our best to piece together the puzzle. Keep scrolling to go over all the evidence.
Source: ABC Family