the help

Janney thrilled a bunch of Lost fans when she showed up unexpectedly as Jacob's mother near the end of the final season, but it's really been since Juno that she had a good, meaty, mainstream role

Chastain is definitely a wild card-- her main acting credit so far is Terrence Malick's highly anticipated Tree of Life, in which she co-stars with Brad Pitt. Since no one has seen that film yet