Hiro attempts to delve into Arthur Petrelli’s past to uncover the mystery behind him creating a rival company Pinehearst and his hatred towards Angela. Sylar stricken by guilt tries to stop his murderous ways with HRG and Elle vying for his blood. Meredith’s training goes up in smoke with the arrival of her brother.

Serena invites Aaron to be her guest at a charity gala honoring Lily and Bart, but after discovering a secret that Aaron has been keeping from her she begins to question whether Aaron is the guy she thought he was. Hoping it will help her chances of getting into Yale, Blair naively agrees to babysit the 15-year-old daughter of a prominent Yale donor, but the teenager proves to be more than a handful and Blair begins to suspect that the evening may actually wind up hurting her chances of getting into college of her dreams. Meanwhile, Jenny and Agnes plan a guerilla fashion show that will either launch Jenny’s star or ruin her chances of ever being accepted by the industry.

Vanessa tries to blackmail Blair into being a nicer person, with the pictures of Catherine and Marcus. Blair then seeks revenge by convincing Chuck to try to seduce Vanessa. Lily and Bart throw an extravagant housewarming party and expect their children to make them proud, but Serena do not want to follow the rules. Meanwhile, Dan and Jenny discover a big secret that Nate has been keeping from his friends.