04E09 - Enemy of My Enemy

The alternate Olivia and Lincoln arrest David Robert Jones and bring him to the Fringe Division headquarters. Peter uses his knowledge about the criminal to help to interrogate him. However David uses his accomplices to create havoc with a terrorist attack that kills everybody in a hospital. They let him go but with a tracking device, but David is warned by Broyles and uses a similar device in dollar bills to escape from his pursuers. Lincoln discloses to the alternate Olivia and Lincoln that it might have a mole within the Fringe Division. Peter and Astrid find that David is searching for a mineral. Capable to open holes between the two universes. Meanwhile Elizabeth decides to help Peter and has a surprising encounter.