The Best Episodes Written By Jesse Alexander

When armed intruders take over SD-6, led by McKenas Cole, a man bent on exacting revenge on ex-boss Sloane, Sydney and Jack must work together to save their colleagues. Meanwhile, Will fears that his investigation of SD-6 and its link to the murder of Eloise Kurtz is placing his life in jeopardy.

Vaughn disobeys orders and attempts to help Sydney and Jack avert the destruction of SD-6 headquarters and all its occupants. Meanwhile, McKenas Cole continues his vendetta against Sloane and searches for a mysterious device. A desperate but determined woman convince Will to continue his investigation of SD-6 and the imprisonment of David McNeil.

Sydney finally learns the shocking truth about her missing two years from an unlikely source.

Will races to stop a rogue surgeon extracting organs from his victims.

Sloane begins to question where Noah's true allegiances lie, as passion ignites between Sydney and Noah. Meanwhile, Sydney continues to uncover new information about her mother, which disturbes Jack. A rogue assassin known as the Snowman is dispatched by K-Directorate to kill Khasinau, a.k.a. "The Man." Will and Francie confront Sydney about the mysterious airline ticket stub found in her jacket.

Sydney goes undercover in a mental institution to get information from Shepard, a man who has been unconsciously programmed to be a deadly assassin. Meanwhile, after Sydney becomes convinced that her father was responsible for the death of her mother 20 years earlier. Will discovers the true identity of the woman who claimed having an affair with Danny and Francie is relieved to learn that Charlie is not having an affair other woman. Marshall finds the computer worm planted in the SD-6 mainframe by the CIA.

Sydney begins to question where Vaughn's allegiances lie when she learns through CIA Agent Yeager that he is under investigation by the Agency. Meanwhile Irina and a crucial Rambaldi manuscript are used as bait to try to catch Sloane, and Sydney welcomes Dixon to the CIA.

Poised to become a member of Congress and maybe more, Nathan considers the cost to those he loves, along with his mother's advice and Linderman's prophecy. As he prepares to face Sylar to the death, Hiro learns of his lineage from his father. While various "heroes" fatefully arrive in New York City, Peter and Claire attempt to leave the city before the foretold explosion. H.R.G.

Sydney must seduce a murderous arms dealer in order to track down a stolen NSA code-breaker. Meanwhile, Vaughn fears for Weiss's life, and Sydney and Jack argue about telling Nadia the truth about her mother.

Facing a crisis involving her son Micah, a distraught Niki reveals her recent personal struggles to a friend. Pushing aside his own issues at home, Matt assists Audrey's investigation into another bizarre murder, but their pursuit of mysterious serial killer Sylar takes an unexpected turn. After failing to act like a "superhero" when faced with danger, Hiro questions his heroism. Nathan and his wife Heidi strategize how to win the congressional election. Claire is shocked to learn where her missing tape wound up. Meanwhile, her father is disturbed by news from one of his associates.

With the aid of Katya Derevko and CIA imprisoned security systems designer Toni Cummings, Sydney and Vaughn attempt to track down Sloane and Nadia. But Lauren and Sark are also in hot pursuit of them in order to uncover the secrets of Rambaldi. Meanwhile, Vaughn's obsession with tracking down Lauren is beginning to consume him, Sydney and Vaughn turn the tables on an old foe, and Katya expresses her attraction to Jack.

Sydney's dealings with her mother lead Jack to take drastic measures to ensure his daughter's safety. Meanwhile Will is confronted by a mysterious woman about resurrecting his story on SD-6.

While Vaughn's life hangs in the balance, Lauren butts heads with Sydney after learning the part she played in his stabbing. Meanwhile, Sydney further questions Sloane's allegiances after he is kidnapped by Kazari Bomani, a kingpin in The Covenant; Jack's cover is jeopardized when he meets with Simon to dig up information on Sydney's missing two years; and Marshall is sent on his second mission with Sydney, posing as a high-stakes, southern gambler.

Sydney and Tom discover that Renie has stolen the cryo container, and soon find themselves under siege by a group of mercanaries who want the contents of the container. Meanwhile, Sloane takes matters into his own hands to get himself back into APO.

Trapped, Nathan and Tracy must fight to save their lives against Suresh, who has changed dramatically. Elle returns with shocking news for Claire and her family. Meanwhile, Angela tries to convince Sylar to save Peter; Daphne is ordered to kill Matt or she will be killed herself; and Hiro questions Usutu's advice.

Peter travels to Primatech in Texas to destroy the virus, but not everything is what it seems. Hiro continues the pursuit of his father's killer, while Matt pursues the last Company member in the photo. Nikki is reunited with Micah but has bad news, while Maya has to choose to remain with Alejandro, or go with Sylar.

Following the epic showdown at Easter's party, Mr. Wednesday continues his quest to pitch the case for war to the Old Gods. Meanwhile, Mr. World plans revenge and Technical Boy goes on the hunt for Media.

As the U.S.S. Discovery crew attempts to let loose at a party, an unwelcome visitor comes aboard bringing about a problematic and twisted sequence of events.

With tensions and stakes high as Starfleet continues in their efforts to end the war with Klingons, Burnham begins to settle in to her new position aboard the U.S.S. Discovery.