1. Pilot In the series premiere, FBI Special Agent Olivia Dunham (ANNA TORV) investigates a fatal international flight, recruiting Dr. Walter Bishop (JOHN NOBLE) and his son (JOSHUA JACKSON) to help.
2. The Same Old Story The unlikely trio forms a partnership and investigates the link between a wildly accelerated pregnancy and an "old" newborn.
3. The Ghost Network After a horrific bus incident, Olivia, Peter and Bishop uncover a man who has visions of Pattern-related disturbances before they happen.
4. The Arrival After a deadly explosion in New York, our unlikely threesome investigate a strange cylinder found at the scene thats completely unharmed by the surrounding devastation.
5. Power Hungry When a simple man is discovered who has the ability to harness electricity, dangerous and deadly occurrences follow, and our unlikely trio investigates this super-charged oddity.
6. The Cure When a woman with a rare disease inexplicably causes excruciating pain and subsequent death to those she encounters, the circumstances point to illegal drug trials -- or worse.
7. In Which We Meet Mr. Jones When a strange parasite attaches itself to the internal organs of a dying agent, Agent Dunham rushes to Germany to meet with a prisoner who reveals details of a much larger threat.
8. The Equation When a music prodigy is kidnapped, it's discovered that a sequence of flashing lights appeared at the abduction - which Walter links back to his bunkmate at St. Claire's Hospital.
9. The Dreamscape While investigating a mystifying incident at Massive Dynamic, Olivia seeks to rid her consciousness of Agent Scott and Peter's past catches up with him.
10. Safe While investigating a series of extraordinary bank robberies that defy the laws of physics, Walter realizes that the high-tech thieves are after something of his.
11. Bound After shifty FBI Agent Loeb orchestrated Mr. Jones's otherworldly escape from a German prison and Olivia's alarming abduction, indications of a larger threat begin to emerge.
12. The No-Brainer A computer scientist-turned-serial killer has discovered an unconventional method of killing people by liquefying their brains.
13. The Transformation When another mysterious virus emerges aboard an international flight, leaving freakish remains, Peter & Olivia are forced to go undercover to investigate the latest bizarre threat.
14. Ability German agents question Olivia when Mr. Jones returns and a lethal toxin is released that causes victims to die without faces - as their orifices suddenly and mysteriously close up.
15. Inner Child The FBI's Fringe Division investigates a mysterious, mute boy with an unspoken connection to Agent Olivia Dunham. Meanwhile, a gruesome serial killer resurfaces.
16. Unleashed Unleashed by animal activists, a scientifically engineered beast with a ferocious appetite attacks Charlie. Walter must now come face-to-face with both his past and the creature.
17. Bad Dreams The Pattern is given a thrilling twist when Agent Dunham can't stop dreaming of violent occurrences - that actually happen simultaneously in the real world.
18. Midnight When severely mutilated bodies drained of spinal fluid begin to pile up, the Fringe Division investigates a scientist with possibleties to the ZFT terrorist cell.
19. The Road Not Taken While investigating a disturbing case of a woman who apparently spontaneously combusted, Olivia is plagued with waking dreams,seeing elaborate visions of things not really there.
20. There's More Than One of Everything In the season finale, the Fringe Division is attacked, Mr. Jones returns, Walter disappears and Massive Dynamics' elusive WilliamBell (LEONARD NIMOY) is finally introduced.