Overview
"The Butterfly Effect" is the second episode of the third season of the NBC superhero drama series Heroes and thirty-sixth episode overall. It was written by series creator/executive producer Tim Kring and directed by Greg Beeman. The episode aired on September 22, 2008 immediately after "The Second Coming" as part of the three-hour premiere event.
Plot
Elle Bishop lets Noah out of his cell on Level 5, giving him a gun and telling him that Sylar is in the building. Sylar regenerates and attempts to take Elle's power by cutting her head open. Elle screams and releases a large electrical discharge that knocks Sylar out and allows the Level 5 prisoners to escape their cells.
Hiro and Ando travel to Daphne's apartment in Paris, looking for the formula that she stole. Hiro notices an award of Daphne's for a track meet from when she was young. Hiro slips a tracking device into the award and offers to return it in exchange for the formula. Daphne gets away with both the award and the formula.
With Bob's death, Angela becomes the new head of the Company, and her first act is to fire Elle. Noah returns to his home and finds Claire alive. Noah and Sandra enlist Meredith Gordon, Claire's biological mother, to protect the family in Noah's absence.
From Wikipedia (CC BY-SA 4.0).