Void Season 2 Episode 1: Carter?

Three Weeks after Will leaves Chase with his new girlfriend Megan something's fishy in Fremont a new Angel is in town and not happy with Cassiel.
Why can't Will and Chase go back to normal because someone is splitting them apart? Carter Spines the new kid in town but who is he exactly?
Chase and Will haven't been on the best of terms since they've became partners again but can they fix there relationship and save the world while Cassiel is sick, In this Supernatural life anything is possible.