The complete seasons One to Four of the US TV drama series about ordinary people across the globe who discover they have extraordinary powers. In Season One, as they discover their new found talents, the superheroes have to come to terms with the impact the discovery has on their lives. Episodes comprise: 'Genesis', 'Don't Look Back', 'One Giant Leap', 'Collision', 'Hiros', 'Better Halves', 'Nothing to Hide', 'Seven Minutes to Midnight', 'Homecoming', 'Six Months Later', 'Fallout', 'Godsend', 'The Fix', 'Distractions', 'Run!', 'Unexpected', 'Company Man', 'Parasite', '7%', 'Five Years Gone', 'The Hard Part', 'Landslide' and 'How to Stop an Exploding Man'. Season Two introduces a number of new characters, including Honduran twins Maya (Dania Ramirez) and Alejandro (Shalim Ortez), the devious and lethal Elle (Kristen Bell), and Hiro's (Masi Oka) idol, Takezo Kensei (David Anders). Episodes comprise: 'Four Months Later...', 'Lizards', 'Kindred', 'The Kindness of Strangers', 'Fight Or Flight', 'The Line', 'Out of Time', 'Four Months Ago...', 'Cautionary Tales', 'Truth and Consequences' and 'Powerless'. Season Three opens with an assassination attempt on Nathan Petrelli (Adrian Pasdar), and traces the consequences of this event far into the future. Meanwhile, the slippery Sylar (Zachary Quinto) accidentally frees a dozen super-criminals who were held by the Company, giving Claire (Hayden Panettiere), Peter (Milo Ventimiglia), Matt (Greg Grunberg), Hiro and the other heroes a whole new line-up of powerful evil-doers to contend with. Episodes comprise: 'The Second Coming', 'The Butterfly Effect', 'One of Us, One of Them', 'I Am Become Death', 'Angels and Monsters', 'Eris Quod Sum', 'Villains', 'It's Coming', 'The Eclipse (Part 1)', 'The Eclipse (Part 2)', 'Our Father', 'Dual', 'A Clear and Present Danger', 'Trust and Blood', 'Building 26', 'Cold Wars', 'Exposed', 'Shades of Gray', 'Cold Snap', 'Into Asylum', 'Turn and Face the Strange', '1961', 'I Am Sylar' and 'An Invisible Thread'. Finally, in Season Four, Claire attends college but has difficulty adjusting to her new life, Hiro's powers are no longer in his control which leaves him thinking he may be dying, and Peter goes back to work as a Paramedic using Mohinder's (Sendhil Ramamurthy) powers to help others. Episodes comprise: 'Orientation', 'Jump, Push, Fall', 'Ink', 'Acceptance', 'Hysterical Blindness', 'Tabula Rasa', 'Strange Attractors', 'Once Upon a Time in Texas', 'Shadowboxing', 'Brother's Keeper', 'Thanksgiving', 'The Fifth Stage', 'Upon This Rock', 'Let It Bleed', 'Close to You', 'Pass/Fail', 'The Art of Deception', 'The Wall' and 'Brave New World'.