The 22nd episode of Gene Roddenberry’s science fiction series Star Trek airs on NBC. Ricardo Montalban guest stars as Khan in the episode that sets up the events of 1982’s movie Star Trek II: The Wrath Of Khan. 
Stardate 3141.9: The Enterprise discovers a derelict vessel which turns out to be an Earth ship dating back to a series of wars in the 1990s in which Earth’s population was threatened by a group of genetically engineered superhuman beings. The inhabitants of the rogue ship, though they try to conceal the fact at every opportunity, are the only surviving oppressors from that war. Their leader, Khan, wishes to resume their reign of terror, beginning with a takeover of the Enterprise.
teleplay by Gene L. Coon and Carey Wilbur
story by Carey Wilbur
directed by Marc Daniels
music by Alexander CourageCast: William Shatner (Captain James T. Kirk), Leonard Nimoy (Mr. Spock), DeForest Kelley (Dr. Leonard McCoy), James Doohan (Mr. Scott), George Takei (Lt. Sulu), Nichelle Nichols (Lt. Uhura), Ricardo Montalban (Khan), Madlyn Rhue (Marla), Blaisdell Makee (Spinelli), Mark Tobin (Joaquin), Kathy Ahart (Crew Woman), John Winston (Transporter Chief Kyle)
Note: At some point during this episode, a pregnant tardigrade arrives aboard the Enterprise, unnoticed by any of the ship’s crew (Short Treks: Ephraim And DOT). Attempts to elaborate on Khan’s story are numerous, from an alternate-timeline version of the character (Star Trek: Into Darkness), to a glimpse of other genetically-augmented superhumans (Enterprise: Borderland / Cold Station 12 / The Augments), to various explanations of Khan’s backstory (Picard: Farewell, Strange New Worlds: Tomorrow and Tomorrow and Tomorrow), the latter of which confirms an earlier hint (Deep Space Nine: Doctor Bashir, I Presume?) that the Eugenics Wars were somehow “shifted” by interference from time travelers from the 1990s, as noted in Space Seed, to sometime in the 21st century (where it becomes part of the inciting events of World War III, according to Strange New Worlds).
LogBook entry by Earl Green