Having traveled back in time 16 years, the immature Hiro seeks out his late mother to try to get his memories back, while Claire has a run-in with a younger Noah Bennett when he was assigned by the company to look after the infant Claire and how she may have become the catalyst for the secret formula. Back in the present, Nathan returns to Pinehurst where Tracy introduces him to a group of U.S. Marines that Arthur has recruited to be his army of super-solders once Mohinder gets the catalyst for the ability-giving formula correct and which hopes the formula will be able to cure his disease... and begin Mr. Petrelli's quest for world domination. Peter and the Hatian return to New York and are sent by Angela in desperate attempt to break into Pinehurst to kill Arthur Petrelli before he can complete the formula. Meanwhile, Ando, Parkman, and Daphne seek out a bicycle messenger who may have the last '9th Wonders' comic book works to learn more about the future and where Hiro is and what to do to save him. Elsewhere, Sylar goes rogue once again by disposing of Elle, and then decides to go after both the heroes and villains to steal their powers for himself.

As Hiro's life continues to hang in the balance, he distracts himself with saving the lives of others. Meanwhile, Angela tries to help the new "Nathan" remember his past, at the risk of his remembering too much. Elsewhere, Tracy is determined to get her old job back, but soon realizes that she needs to make more of an impact.