The Fringe team visits Walter's old lab at Harvard to see if he might have documented his information from September.

They use old tunnels to get to the lab and run into a Loyalist who is needed to get to other parts of the university.

The Loyalist cons Olivia into believing his story, but Etta is untouched.

Peter and Etta find Simon.

Etta chooses not to kill the Loyalist because she saw pity in Olivia's eyes.

Walter finds a betamax recorder that tells them to find the rest of the tapes to piece together the clues to saving the world.