Watch Over Me: Invitations

Natalie tells Julia the brakes were cut in the accident that killed Michael's wife and Natalie's son; Jack and Dr. Rivera realize Michael's plan: use Medusa -- an incurable disease -- to infect the world and then save it with Perseus, the only thing that can cure it. Meanwhile, Natalie freaks out when Julia comes with Jack to a party in Eric's loft, and shocked to find Jack and Julia kissing; Michael hooks up with Caitlin; Dr. Rivera warns Jack that Michael's close to finding out his relationship with Julia.