Both Ians board the enemy ship, which has proven to be flown by a dead pilot, only to discover that it's the same ship Ian will one day find on Earth.  But Jackie discovers something dark inside that nobody yet understands.

While Sally and Ian argue with Ian's counterpart from a different world, a devastating attack takes place elsewhere, and they are only now beginning to feel its impact.

Sally and both Ians discuss possible ways in which they can work together to solve their common problem, but dark information surfaces about who Angela might have been under different circumstances.

Sally's team must negotiate with their new arrival to see what they should do to repair history, but soon find that they are working at cross purposes.  The nature of their problem now looks yet more hopeless.

In Sally's search for answers, she finds herself confronting the Benefactor.  But, through the course of their conversation, she opens a door she couldn't have imagined and pulls through someone who should not be.