Our current Jessica Chastain era snuck up on me. Chastain's meteoric rise happened so fast that I just kind of went along with it. In other words: I was ill prepared for Chastain's dominance over the last few months. Who is this person and how did she manage to sneak up on an unsuspecting world? It might seem like Chastain -- star of 'The Help,' 'The Debt,' 'Tree of Life' and this weekend's limited release, 'Take Shelter,' plus the upcoming 'Texas Killing Fields' and 'Coriolanus' -- came out of nowhere, but that's not exactly true. Every actor has an origin, even the ones who are currently in the midst of their breakout year. So let's take a look at five early roles from Chastain, including her first on a show called 'ER.'