The new and different Sylar pays Matt a visit, while Peter tries to warn Emma that Samuel isn't what he seems. Meanwhile, Noah begins his plan to infiltrate the carnival and capture Samuel.
While being held hostage, H.R.G. is subjected to Matt Parkman's unique brand of interrogation, revealing how he became involved with Nathan's government plot to capture those with abilities.
After receiving a tip from 'Rebel', Matt and Peter race to Building 26 to rescue Daphne and recover files that will expose the government's plans for those with abilities.
After reuniting Sylar and Elle, Arthur orders them to find Claire and bring her to him. Meanwhile, Nathan and Peter Petrelli travel together to Haiti in search of the only man that can stop their father from destroying the world.
In the aftermath of the showdown against Arthur Petrelli, the Petrelli brothers find themselves battling against one another. Nathan makes a move that will have global repercussions.
A restored Sylar seeks out the carnival to obtain a new batch of powers, but discovers a new weakness. Meanwhile, Claire and Peter try to resolve their emotions at Nathan's wake.
Sylar visits Claire, while Hiro's past decisions manifest subconsciously due to his brain tumour. Meanwhile, Samuel tries to impress Vanessa, his long-lost love, but things don't go as planned.
As Danko spearheads the government operation, someone close to him is put in the line of fire. Meanwhile, H.R.G.'s life continues to spiral out of control.
Samuel prepares for new additions to his family, while Lydia warns him of the consequences. Meanwhile, Claire discovers that her roommate Gretchen may have a hidden agenda.
H.R.G. is greeted by some unexpected visitors and Samuel's grand plan begins to come to fruition. Meanwhile, Peter struggles to accept the truth and takes extreme measures to get what he wants.
Nathan's determination to save a comatose Peter forces him to turn to Simone for help. Isaac's puzzling "Hiro vs. T-Rex" painting inspires Hiro and Ando to search for the pictured samurai sword.
Chased by unknown assailants, Hiro's search for the sword takes a turn when his father appears. Meanwhile, a cleaned-up Isaac dedicates himself to stopping New York's destruction.
With the election and NYC's destruction looming, Nathan has a disturbing face-to-face meeting with the shadowy Linderman. Meanwhile, Hiro's attempt to steal the sword steers him in a grim new direction.
Nathan must factor what he's learned from Linderman into difficult decisions that will shape the future - for him, his family, New York City and the world.
Thrown five years into the future, Hiro and Ando discover that people with extraordinary abilities are being registered, imprisoned, hunted and even killed.
Poised to become a member of Congress and maybe more, Nathan considers the cost to those he loves, along with his mother's advice and Linderman's prophecy.
With Isaac's horrible predictions all unfolding before them, the everyday people with extraordinary abilities face moments of pain and peril in Kirby Plaza with unflinching heroism.