Everyone bands together to try to stop Samuel from taking the lives of thousands; Peter teams with an unexpected ally to save Emma; H.R.G.’s life hangs in the balance; Hiro comes to grips with decisions he has made.
Fueled by his vision of Emma in grave danger, Peter attempts to rescue Sylar from his worst nightmare. At the carnival, Samuel reveals H.R.G.s secret past in order to bring Claire to his side. Meanwhile, Lauren makes a bold move to put a stop to Samuel.
.R.G. enacts his plan to take down the Carnival with the help of Lauren and Suresh. Sylar visits Matt looking to understand his desire to make a human connection, but Matt has a plan of his own. Meanwhile, Peter warns Emma of Samuel’s intentions after his grim vision of the future.
Sylar visits Claire, while Hiro’s past decisions manifest subconsciously due to his brain tumor. Meanwhile, Samuel tries to impress Vanessa, his long-lost love, but things don’t go as planned.
While Hiro and Ando attempt to save Suresh, Bennet tries to expose Samuel’s weakness in his attempt to defeat the carnival leader.
Claire joins the carnival but begins to suspect Samuel has a secret agenda. Bennet recruits Matt in his battle against Samuel, while Hiro goes to help a friend.
As Claire becomes immersed into the world of the Carnival, she becomes increasingly suspicious of Samuel’s motives. Hiro is on a mission to rescue one of his own, but has difficulty communicating his intentions to Ando. Samuel has his sight set on Emma and her ability to complete his master plan. Meanwhile, Sylar returns to the Carnival in search of answers and Peter continues to struggle with the loss of his brother.
oah has a surprise run-in with visitors; Samuel makes progress on his plan; Peter goes to extremes to obtain what he wants; and Claire comes to an unexpected destination
H.R.G. hosts an untraditional Thanksgiving dinner. Elsewhere, the Petrelli family gets a surprise guest at their table. Meanwhile, Samuel continues to hold Hiro hostage, as Lydia goes in search for the truth.
Samuel learns just how powerful he can become and takes dangerous measures to reach his full potential. Meanwhile, as Tracy begins to lose control of her ability, one of her own comes in harms way. Elsewhere, Sylar continues his battle with Matt.