Tonight is Episode 100 of Pretty Little Liars and things are going to get crazy. Watch the first seven minutes here!
It's Alison's (Sasha Pieterse) first day back at Rosewood High, and Mona (Janel Parrish) and her army of avengers are not about to let that go unnoticed. Not much is given away in the first act, but Tranna, Ezria and Spoby fans will get to see their couples interact. Also, it looks like Jenna (Tammin Sursok) has returned and all bets are off!