A patient at a mental hospital undergoes an impromptu surgery that unexpectedly leaves his brain exposed; Olivia sees... Full summary

When a cargo ship runs aground, the shoreline is littered with bodies, each hosting a large squidlike creature.

A peculiar abduction in Boston leads the team to uncover details of the mysterious man known as the Observer; Walter,... Full summary

A kidnapping rapidly escalates into a hostage situation, and authorities closing in discover that an unknown force has... Full summary

In Seattle the team investigates a man's attack on his boss, who he thought was a ram-horned demon; Broyles has a... Full summary

Olivia consumes a concoction Dr. Bishop gives her in hopes of stimulating her memory; the team investigates a series... Full summary

A bomb blows up inside a train station but leaves no trace of any explosive device; Peter and Olivia's investigation... Full summary

A construction worker goes missing after he is mysteriously drawn into an underground tunnel full of human remains;... Full summary

Peter, unwittingly in a race against time with an ominous force, investigates Olivia's visit to a parallel universe.

The first-season finale includes an appearance by the much-discussed, but never seen, Massive Dynamics founder,... Full summary