As the clock counts down to the end of the world, Tommy finds himself up against his biggest challenge yet as Erica takes drastic measures to see her plan succeed. Malina tries to fulfill her great-grandmother's prophecy to save the world with the help of Luke and Quentin. Emily and Ren desperately search for Miko. Carlos is faced with a life and death choice.

Tommy helps Erica with her survival plan as the end of civilization approaches; Malina rushes to reunite with Tommy as a plot against them is formed; Matt Parkman's attempts to make sure he and his family are safe could jeopardize Taylor's safety.

Following Noah's mysterious disappearance, Luke and Malina unite to rescue Tommy and save mankind. At the mysterious Sunstone Manor, Carlos and Farah fight alongside The Haitian to take down Matt Parkman and free the prisoners under his control. Tommy and Miko join forces against Erica and her brutal plan for the future.

The destinies of Noah and Luke finally intersect as Malina unleashes her true power to save those around her. Tommy may need to join forces with his enemy, Erica Kravid, to complete his mission. Meanwhile, Carlos confronts his violent past while under the watchful eyes of Matt Parkman. Elsewhere, Ren is tasked with the impossible mission of finding Miko.

Noah is on the hunt for Tommy to reveal his past to him and guide him on his destiny to stop a catastrophic event. Taylor's discoveries about her mother, Erica Kravid, leads to her capture by an underground group. Erica escalates her search for Tommy and Malina as the race to finalize her dangerous plans intensifies. Elsewhere, Emily has an unexpected reunion with Joanne. Meanwhile, Dearing leads Carlos closer to finding his kidnapped nephew and Luke and Malina are separated in a violent encounter.

In the wake of an unspeakable tragedy, Erica Kravid puts her dark plan into motion with Renautas. Hiro and Angela are tasked with an important mission that could change the course of humanity. In Odessa, a distraught Luke and Joanne come to realize their tragic mission after the loss of their son. Meanwhile, Noah Bennet has an unexpected reunion with Matt Parkman. In Japan, the origins of Miko come to light. Elsewhere, the truth behind Carlos' military service is revealed.

In an effort to get answers, Noah Bennet joins forces with Hiro Nakamura to return to the day of the tragic events of June 13, 2014 that set everything in motion. On the verge of delivering a speech to commemorate the event, Mohinder Suresh receives a dire message from Angela Petrelli about Erica Kravid's true motives. In Japan, Hachiro Otomo makes a calculated move against Hiro Nakamura. Meanwhile, a much happier Luke and Joanne come to Odessa in hopes of finding a cure to their son's ailment.

Noah Bennet takes matters into his own hands to get much-needed answers. After Tommy makes a startling discovery, he and Emily go on an unexpected journey. Elsewhere, Luke continues to come to grips with the fact that he has become what he has been hunting. Malina finds a surprising ally. Miko stays on the course to save her father, but Erica takes measures to interfere. Meanwhile, Carlos learns more about what is really going on with EVOS from an unlikely source.