Meredith finally tells Derek about her pregnancy and miscarriage; during a surgery, Cristina experiences PTSD; Bailey won't let Alex operate until he has the bullet in his chest removed.

A genetics professor in India discovers that there are people with superpowers, as people realize their extraordinary strengths.

The murder of a teenage boy leads to a dubious high school principal, a terrifying legend, and a mysterious secret society.

As they embark on their journey to New York, Hiro and his friend Ando are stopped by a Las Vegas high roller who offers them a deal they can't refuse.

The police arrive on Niki's doorstep searching for her fugitive husband, and Matt uses his abilities to help his marriage.

Matt assists Audrey on a murder investigation, as their pursuit of the mysterious serial killer Sylar takes an unexpected turn.

Claire's homecoming celebration becomes a frightening night for many, Hiro travels back in time to right a wrong, and Suresh continues to experience strange dreams while in India.

Shocking details are revealed about the moments leading up to Isaac's prediction about a nuclear blast in New York City.

Claude tries to teach Peter how to better handle his abilities, but the process could shake Peter's faith in those closest to him.

Peter learns that someone close to him may have betrayed him and Claude. The radioactive man and Hana Gitelman drop in on Matt.

Nathan has a disturbing face-to-face meeting with the shadowy Linderman as the election and New York City's impending destruction draw near.

Matt accepts a dangerous job as a bodyguard for a crooked attorney, and the shocking truth about Claire's real father is revealed.

The extraordinary strive to be ordinary four months after the explosive events in New York, and new individuals with abilities emerge worldwide.

Matt and Ted Sprague take H.R.G. and his family hostage in their search for answers, which leads to an explosive showdown.

Matt investigates the death of a hero, another hero is attacked by a new sinister force, and Niki, Micah and the Haitian return.

Upon his return to New York, Suresh finds a previously undiscovered painting that foretells the death of someone close to him, Claire and H.R.G. pursue their own agendas, and Maya uses her deadly abilities to free Alejandro from a Mexican prison.

A new hero emerges in New Orleans, Angela Petrelli makes a shocking confession as new information about the heroes is revealed, and Maya and Alejandro make a grim discovery.

Debra's hippie sister, Jennifer, visits Ray and Debra's home and announces she has decided to become a nun.

A sudden manifestation of one of Peter's forgotten abilities throws him and Caitlin into a crisis situation, heroes band together to fend off the "nightmare man", West learns who kidnapped him as a child, and Hiro's journey takes a dramatic turn.

Peter tries to destroy the virus he believes will kill most of the world's population, Niki has bad news for Micah, Hiro goes after his father's killer, and Matt uses his abilities to track down the last person in the Company photo.