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In the climactic season finale, everyone bands together in an effort to stop Samuel (Robert Knepper) from taking the lives of thousands. Peter (Milo Ventimiglia) joins forces with his most unexpected ally to save Emma (guest star Deanne Bray).
H.R.G. (Jack Coleman) enacts his plan to take down the Carnival with the help of Lauren (guest star Elizabeth Rohm) and Suresh (Sendhil Ramamurthy).
H.R.G. (Jack Coleman) recruits Matt (Greg Grunberg) to help him take down Samuel (Robert Knepper), as they use his long-lost love, Vanessa (guest star Kate Vernon), to lure him to them, but Samuel has his own plans for Vanessa in the works.
H.R.G. (Jack Coleman) is greeted by some unexpected visitors and Samuel‘s (Robert Knepper) grand plan begins to come to fruition.