Claire (Hayden Panettiere) s mukom pokušava se prilagoditi svomu novom životu na fakultetu, no misteriozna smrt ponovno je dovodi u središte pozornosti. Hiro (Masi Oka) i Ando (James Kyson Lee) nastavljaju svoj plemeniti pothvat pomaganja ljudima kako bi predstavili svoje sposobnosti. Angela (Cristine Rose) boji se da će Nathan (Adrian Pasdar) uskoro otkriti svoj pravi identitet, a Matta (Greg Grunberg) progoni neočekivani posjetitelj koji traži nešto što je izgubio. Tracy Strauss (Ali Larter) i H.R.G. (Jack Coleman) udružuju se kako bi otkrili motiv iza strašnog zločina. U međuvremenu, Peter (Milo Ventimiglia) upotrebljava svoje sposobnosti za dobro, no uskoro je prisiljen pomoći starom prijatelju. Dok se heroji prilagođavaju novom životu, tajanstveni karnevalski klan pod vodstvom Samuela (Robert Knepper) počinje se zanimati za poznata lica.

Claire i njezina nova prijateljica Gretchen istražuju smrt Annie koja je cimerica sa Claire.U međuvremenu Noah dolazi do Petera da mu pomogne, Hiro shvaća svoju novu sudbinu, a Matt se muči s mentalnim slikama iz opasnog neprijatelja.

As "Nathan" starts displaying new powers, he has visions of an incident from his past involving a young girl and decides to investigate. Hiro tries to save a co-worker and learns a truth about himself. Tracy tries to regain her old life and job.

Samuel (Robert Knepper) priprema se za prinove u obitelji, dok ga Lydia (tumači je Dawn Olivieri) upozorava na posljedice. Claire (Hayden Panettiere) otkriva da njezina cimerica Gretchen (gostujuća Madeline Zima) možda ima skrivene namjere. U međuvremenu, Peter (Milo Ventimiglia) pronalazi neočekivan način povezivanja s Emmom (gostujuća Deanne Bray) koja se radije ne bi zbližavala. Drukčiji se Sylar (Zachary Quinto) očajnički pokušava sjetiti osobe koja je nekoć bio.

Under Samuel’s guidance, Sylar starts on a path to rediscover his true identity. Hiro helps Emma accept and understand the great possibilities that go along with having an ability. Meanwhile, Peter enlists HRG to help him find a healer who can save Hiro’s life.

Matt goes to extreme measures to extinguish Sylar , who continues to torment him. Elsewhere, HRG calls in a favor from Tracy to save a troubled young boy whose misfortunes resemble her own. While Claire and Gretchen are being hazed by their new sorority sisters, they realize pledging might not be their biggest problem.

When Hiro travels three years into the past, he has a second chance to save Charlie from the hands of Sylar. However, Samuel’s presence serves to complicate Hiro’s mission even further. Elsewhere, H.R.G.’s past with his Primatech partner is revealed.

Claire is determined to get to the bottom of the Sorority Rush attacks on her own, until H.R.G. intervenes only to realize he may be the source of her troubles. Meanwhile, Peter's new ability is a perfect fit for his job and gives him the opportunity to help Emma accept her new life. Elsewhere, Sylar's battle at gaining full control over Matt's body escalates with potentially dangerous implications at stake.

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.

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.

Unexpected visitors greet H.R.G.; Samuel's plan starts to come to fruition; struggling to accept the truth, Peter takes extreme measures to get what he wants; Claire's journey leads her to an unexpected destination.

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.

Claire (Hayden Panettiere) se upleće u svijet Karnevalskog klana i počinje sumnjati u Samuelove (Robert Knepper) motive. Hiro (Masi Oka) spašava nekoga svog, ali teško iskazuje svoje namjere Andou (James Kyson Lee). Samuel se usredotočio na Emmu (gostujuća Deanne Bray) i njezinu sposobnost da dovrši njegov veliki plan. Sylar (Zachary Quinto) se vraća u Karnevalski klan u potrazi za odgovorima, a Peter (Milo Ventimiglia) i dalje se bori s gubitkom svog brata (Adrian Pasdar). H. R. G. (Jack Coleman) pokreće svoj plan za rušenje Karnevalskog klana.

H. R. G. (Jack Coleman) koristi pomoć Matta (Greg Grunberg) i stare ljubavi Vanesse (gostujuća Kate Vernon) kako bi zaustavio Samuela (Robert Knepper), ali Samuel ima druge planove za Vanessu. Hiro (Masi Oka) i Ando (James Kyson Lee) uz teške muke spašavaju dr. Suresha (Sendhil Ramamurthy). Peterovo (Milo Ventimiglia) upoznavanje Emme (gostujuća Deanne Bray) sa svojom majkom (Cristine Rose) uzrokuje mračne vizije budućnosti.

Hiroov (Masi Oka) život visi o koncu jer raste njegov tumor na mozgu. Nesvjesno se bori s prošlim životnim odlukama. Sylar (Zachary Quinto) neočekivano posjećuje Claire (Hayden Panettiere) kako bi saznao zašto se ne osjeća normalno. Samuelov (Robert Knepper) plan da osvoji staru ljubav Vanessu (gostujuća Kate Vernon) završava zastrašujuće.

H. R. G. (Jack Coleman) pokušava uništiti Karnevalski klan uz Laureninu (gostujuća Elizabeth Rohm) i Sureshovu (Sendhil Ramamurthy) pomoć. Sylar (Zachary Quinto) posjećuje Matta (Greg Grunberg) kako bi shvatio svoju želju za ljudskom povezanošću, ali Matt ima svoj plan. Peter (Milo Ventimiglia) upozorava Emmu (Deanne Bray) na Samuelove (Robert Knepper) namjere nakon svoje mračne vizije budućnosti.

Nakon vizije Emme u smrtnoj opasnosti, Peter pokušava spasiti Sylara iz njegove najgore noćne more. U Karnevalskom klanu Samuel otkriva H. R. G.-jevu tajnu prošlost kako bi pridobio Claire. Lauren poduzima smion korak kako bi zaustavila Samuela.

Peter (Milo Ventimiglia) udružuje se s neočekivanim saveznikom kako bi spasio Emmu (gostujuća Deanne Bray). H. R. G.-jev (Jack Coleman) život visi o koncu kada ostane zatočen ispod zemlje bez kisika s Claire (Hayden Panettiere). Hiro (Masi Oka) se pomiruje sa svojim odlukama i kreće u akciju kako bi zaustavio katastrofu.