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Mark continues his interrogation of Hellinger; Lloyd finds something that could help him solve the complex equation from his flashforward; Tracy fights for her life.
Mark does everything in his power to protect Gabriel; Aaron risks his life in an attempt to rescue his daughter; Janis must kill a fellow agent.
April 29, 2010, arrives as everyone waits to see if the flash-forward predictions take place; Mark uncovers the date of the next blackout; Simon and Demetri break into the NLAP mainframe.