The title of the second chapter is full of meaning. The term ''butterfly effect'' has to do with a consequence that happens three years later for something you have done now. More specifically a butterfly's flappig of its wings could result in a whirlwind in the future.
Sylar leaves from the Bennets and heads to the Company to collect more powers. Elle figures a plan to take down Sylar but she arrives too late as her father ends up dead by Sylar. Elle frees Noah to help her with Sylar. Sylar attacks her and Noah. In an attempt to kill Elle she has an electrical outburst and frees all 12 prisonerz in Level 5 while she knocks down Sylar. Noah puts Sylar in the cell while Elle is fired from the Company by the new head; Angela Petrelli. Angela takes some dangerous measures for the greater good; she reveals a deadly secret to Sylar.
Claire deals with the fact that she can't feel pain anymore and attempts to stand before a running train to see if she can be killed. At that moment, Future Peter flies and saves Claire. Claire asks Peter to teach her how to use her ability offensively but he refuses and leaves. Returning home, she finds her father who has returned only for a while. He tells her he has to go away again because a group of dangerous superpower villains has escaped from Level 5 of the Company and he is the only one who can bring them back (we see some of the villains in this episode and Noah explains their abilities). In return, Noah introduces the person who will protect them if there is another unexpected visit; her biological mother Meredith Gordon (that we met in Chapter 14: Unexpected of volume 1).
Future Peter is visited by Angela who explains to him that his visit to the present has dire consequences. Nathan's shot had as a consequence Sylar's attack to Claire (and thus the thing our Heroes tried to avoid the most; Sylar to gain Claire's regenerative power). When Peter visits Claire he witnesses her pain by himself. Trying to fix what he has done, he goes to Level 5 in the Company to save Peter but he is told that they have escaped.
Hiro is still on his mission to retrieve the part pf the formula stolen by Daphne --the speedster-- and together with Ando they go to Paris. There, Hiro reveals to Ando the dark future he visited in the last chapter and how Ando killed Hiro. Meanwhile, Hiro tries to negotiate with Daphne but with not much luck. Daphne takes off to Berlin, Germany to retrieve the second part of the formula and Hiro has a tracker on her.
Matt is in the desert and is rescued by a man. He tells him he is in Africa and that Matt has a spirit walk to go through before he returns to USA.
Tracy convinces the Governor to count Nathan as the new Senator. She visits Nathan and after an intervention by Linderman and future Peter (who revealed his true identity) Nathan accepts Tracy's offer. Meanwhile, a reporter faces Tracy and reveals he has secrets about Tracy. Appearantly he has found a website with someone looking like her (Niki's stripping website seen in chapter 1: In his own image of volume 1) and a video of her and Nathan having sex (seen in chapter 4: collision of volume 1). In a moment of panic, Tracy exhibits her power of freezing and freezes the report who is shattered. Mohinder has tested his new formula and recognizes many differences. He has strength, stamina, speed and he is able to walk on walls. Maya is fascinated by this discovery but still has her doubts. Mohinder and Maya come closer together. In the end however Mohinder realizes that this power may come with some unexpected consequences; a strange affliction to his skin.
Overall an excellent episode which is put smoothly together with the previous chapter. Key facts: Tracy's power which proves she is not in fact Niki Sanders. Linderman turns out to be only visible to Nathan for some reason. Sylar has acquired one more power and Angela reveals his "true identity" which won't be confirmed until the very end of this volume. Enjoy!