Everyone bands together in an effort to stop Samuel from taking the lives of thousands. Meanwhile, Claire and HRG find themselves trapped underground.
Brave New World: Samuel's ultimate plan spells disaster for thousands - Ray Park, Deanne Bray and Elisabeth Rohm Guest Star.
The Wall: Sylar's worst fears come to life as H.R.G faces his past - Eric Roberts, Madeline Zima, Deanne Bray and Elisabeth Rohm Guest Star.
The Art Of Deception: The tables are turned as H.R.G. attempts to gain the upper hand.
Pass/Fail: The verdict of an unexpected trial could mean the end of Hiro - George Takei, Tamlyn Tomita, Madeline Zima, Dawn Olivieri and David Anders guest star.
Close To You: H.R.G. exposes Samuel's greatest weakness in an effort to stop him - Lisa Lackey, Dawn Olivieri and Elisabeth Rohm guest star.
Sylar returns to the Carnival unable to kill; H.R.G. tries to forge an alliance with Edgar, while Claire and Peter unite in mourning Nathan's death.
The Fifth Stage: Samuel starts to see his vision take shape.
Thanksgiving: Thanksgiving unites families together and brings new revelations.
Brother's Keeper: The truth sets our heroes on new and dangerous paths.
Shadowboxing: Claire learns the truth behind the attacks and Sylar takes matters into his own hands. Jimmy Jean-Louis, Madeline Zima, Deanne Bray, Dawn Olivieri and Tessa Thompson Guest Star.
Once Upon A Time In Texas: Hiro gets a second chance to save the love of his life - Jayma Mays returns as Charlie.
Strange Attractors: The Heroes attempt to rescue themselves and others without the use of their powers.
Tabula Rasa: Sylar begins his journey to find his identity and Peter comes to the rescue of one of his own - Ellen Greene, Ray Park, Dawn Olivieri, Deanne Bray and Ernie Hudson guest star.
Hysterical Blindness: Self-discovery rocks their world as our heroes encounter new abilities, try to recall past lives and stumble upon an unexpected kiss.
Acceptance: The Heroes are trying to assimilate back into their old lives - Robert Knepper, Ray Park, Bruce Boxleitner and Swoosie Kurtz guest star.