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.
Elenco: Greg Grunberg , Ali Larter , Masi Oka , Hayden Panettiere , Adrian Pasdar , Sendhil Ramamurthy , Milo Ventimiglia , Jack Coleman , Robert Knepper , James Kyson , Cristine Rose , Zachary Quinto , Greg Grunberg , Jack Coleman , James Kyson , James Kyson Lee , Jayma Mays , Jimmy Jean-Louis , Kristen Bell , Leonard Roberts , Lestat , Lyndsy Fonseca , Malcolm McDowell , Masi Oka , Noah Gray-Cabey , Robert Knepper , Santiago Cabrera , Sendhil Ramamurthy , Stephen Tobolowsky , Tawny Cypress .