H.R.G. enacts his plan to take down the carnival; looking to understand his desire to make a human connection, Sylar visits Matt; Peter warns Emma about Samuel's intentions.
Hiro subconsciously deals with some of his past decisions as his brain tumor worsens; Claire receives an unexpected visit from Sylar; Samuel's plan to impress Vanessa takes a frightening turn.
Fueled by his vision of Emma in danger, Peter tries to rescue Sylar; H.R.G.'s past is revealed; Lauren tries to stop Samuel.