Peter and the Haitian go after Arthur and Angela tells them that they must kill him.  Meanwhile, Hiro and Claire are in the past on the day that Mr Bennet was first given his new charge, Claire herself.  Hiro visits his mother and convinces her to give him the catalyst.  Just before Hiro and Claire can leave, Arthur shows up and takes the catalyst from Hiro.  He shoves him off the rooftop and returns with Claire to the present.  Meanwhile, Sylar returns to Pinehurst just as Peter shoots at his father and stops the bullet in mid flight.  He uses his new abilities to determine the truth to discover that Arthur is indeed lying to him about being his son.  He lets the bullet go and kills Arthur.  It's a little too late, however, as the first batch of the formula is being tested on a military man, giving him strength abilities.