Nathan and Peter square off afterNathan discovers that their father is dead.  Sylar locks down the Primatech facility with Claire, Mr Bennet, Angela and Meredith inside.  Ando uses the formula to give himself powers thinking that he can use them to teleport back and save Hiro.  Instead get gets the ability to amplify others abilities.  Daphne uses this to travel back in time with Ando and bring Hiro into the present.