"Space Seed" Khan makes his introductory appearance as the antagonist in the episode "
Space Seed", first broadcast on February 16, 1967. According to the backstory revealed in the episode, Khan is one of a group of
genetically engineered
superhumans, bred to be free of the usual human mental and physical limitations, who were removed from power after the Eugenics Wars of the 1990s. Khan had been both the most successful conqueror and the most benign ruler of the group, ruling more than a quarter of the Earth's area across
Asia to the
Middle East from 1992 to 1996 with a firm but generally peaceful hand until he was deposed. While most of the supermen were killed or sentenced to death, Khan and 84 others escaped Earth by way of the
sleeper ship SS
Botany Bay.
Botany Bay is discovered by the crew of the
Starship Enterprise in 2267, with Khan and 72 of the 84 crew members of
Botany Bay still alive,
cryogenically frozen in suspended animation. When Khan's sleep chamber malfunctions, he is transported to the
Enterprise, where he reawakens and learns he is in the 23rd century. Given spacious quarters while
Botany Bay is towed to a starbase, Khan fascinates and charms the ship's historian,
Marla McGivers (
Madlyn Rhue), while using his access to the ship's technical manuals to learn how to take over and operate the
Enterprise. McGivers agrees to help Khan revive the other supermen, allowing him to organize an attempted takeover. To coerce the
Enterprise crew to cooperate with him, Khan places Captain
James T. Kirk (
William Shatner) in the ship's decompression chamber and threatens to kill Kirk unless the crew submits. McGivers cannot stand by as her captain dies and frees Kirk, who neutralizes Khan's men by using a neural gas. Khan heads to engineering and sets the ship's engines to self-destruct, whereupon he is incapacitated by Kirk. Captain Kirk conducts a hearing, sentencing Khan and his followers to exile on an uncolonized world, Ceti Alpha V. Khan accepts Kirk's challenge—evoking the fall of
Lucifer in
Milton's
Paradise Lost—and McGivers joins Khan rather than face court-martial.
Spock (
Leonard Nimoy) wonders what the "seed" Kirk has planted will bear in a hundred years.
Star Trek II: The Wrath of Khan Khan returns as the antagonist in the 1982 feature film
Star Trek II: The Wrath of Khan. Captain
Clark Terrell (
Paul Winfield) and First Officer
Pavel Chekov (
Walter Koenig) of the USS
Reliant are searching for an uninhabited world to test the Genesis device, a powerful
terraforming tool. They beam down to what they believe is Ceti Alpha VI; however, Chekov soon discovers the
Botany Bay and realizes their true location. After Khan and his people capture them, Khan confirms that the barren world is in fact Ceti Alpha V; Ceti Alpha VI exploded six months after he and his people had been marooned, and the resulting shock shifted the orbit of their planet. The cataclysm rendered Ceti Alpha V nigh-uninhabitable. Twenty of the survivors, including McGivers, whom Khan had married, were subsequently killed by the only surviving animal life, the Ceti eel. Swearing vengeance on Kirk, now an admiral, for abandoning them to die, Khan infests Terrell and Chekov with young Ceti eels; the creatures enter their brains, rendering them vulnerable to suggestion. Khan, intent on seizing control of the Genesis device, then seizes control of the
Reliant. Author
Greg Cox penned three
Star Trek novels featuring Khan, published by licensee
Pocket Books. In the two-volume
The Eugenics Wars: The Rise and Fall of Khan Noonien Singh, Khan is depicted as a North
Indian from a family of
Sikhs. "Khan" is a title; his adoptive parents are from
Chandigarh,
Punjab, India and are both eugenic scientists. At the end of the second novel, Khan and his followers are placed aboard the
Botany Bay by
Gary Seven as part of a deal to stop Khan's machinations on Earth. The 2005 follow-up,
To Reign in Hell: The Exile of Khan Noonien Singh, relates what happened to Khan and his fellow exiles between the events of "Space Seed" and
The Wrath of Khan. A different version of Khan's exile on Ceti Alpha V is depicted in
IDW Publishing's 2010 comic miniseries
Khan: Ruling in Hell. From 2013 to 2014, IDW published a five-part series of comic books telling the story of the
Into Darkness incarnation of Khan. The first issue in the series acknowledges the discrepancy of Khan's physical appearance compared to that of the previous incarnation. In keeping with the prime timeline's backstory, Khan's beginnings, rise to power, and involvement in the Eugenics War are depicted. It is also revealed his birth name was Noonien Singh and that he adopted the title "Khan" out of admiration for
Genghis Khan. The series goes on to mention that Khan's anatomy and memories were altered per Marcus's orders, so that Khan would initially believe himself to be the fabricated Harrison.
Star Trek: Khan (audio drama) A new take of Khan's backstory is presented in the nine-part 2025 audio drama
Star Trek: Khan, which explores his nearly two decades of exile on Ceti Alpha V. Written by
Kirsten Beyer and
David Mack, based on a story by
Nicholas Meyer, and directed by Fred Greenhalgh, it is conceived the first
canonical bridge between the events of
Space Seed and
The Wrath of Khan. The series depicts Khan (voiced by
Naveen Andrews) and his followers – including Marla McGuyvers (voiced by
Wrenn Schmidt) – as they attempt to build a new society after their banishment by Captain Kirk. Confronting dangerous species, including the neuroinvasive Ceti eels, as well as environmental instability and planetary threats following the destruction of the neighbouring planet, Khan's leadership is tested and his community faces mounting losses. The narrative introduces additional factions on the planet, expanding the political and moral pressures shaping Khan's rule, tracing his transformation from a self‑styled visionary into a hardened figure driven by grief and betrayal. The
framing story, set a few decades later, introduces archaologist Dr. Rosalind Lear (voiced by
Sonya Cassidy), working with
Captain Hikaru Sulu and
Ensign Tuvok (voiced by their original actors
George Takei and
Tim Russ) on the
U.S.S. Excelsior. ==Development==