Star Trek spin-off fiction

The Star Trek franchise has produced a large number of novels, comic books, video games, and other materials, which are generally considered non-canon.

Star Trek spin-off fiction frequently fills in "gaps" within the televised show, often making use of backstage information or popular fan belief. Although officially licensed spin-off material will often maintain continuity within itself (particularly within books by the same authors), elements often contradict each other irreconcilably. For example, the end of Kirk's five-year mission has been depicted in several different incompatible ways.

Much fiction is set in a second five-year mission of Kirk's Enterprise, which the Okuda chronology dates after Star Trek: The Motion Picture (although novels often placed it before). Backstories and fates of characters are often elaborated on, an example being Leonard McCoy's divorced status, and his daughter, Joanna, originally intended to appear in what became the TOS episode "The Way to Eden".

Several original series characters are established as still being alive in the TNG era, including McCoy, Spock, and Scotty. In the books written by William Shatner, these are joined by a revived Captain Kirk. Several novels depict the careers of the younger members of the Enterprise crew after Star Trek VI: The Undiscovered Country. Captain Sulu and his daughter Demora Sulu appear in Peter David's novel The Captain's Daughter. In the novel The Sundered, Chekov serves as Sulu's first officer on the USS Excelsior. The novel Federation has Chekov eventually becoming an admiral. Uhura is shown, in the novel Catalyst of Sorrows, to be Chief of Starfleet Intelligence in 2360. The 2006 novel Vulcan's Soul: Exiles has an Admiral Pavel Chekov, and Uhura is still serving as head of Starfleet Intelligence in 2377, at the age of 138. Peter David's novel Imzadi explores the backstory between Riker and Troi, and its sequel Triangle: Imzadi II covers the cooling of the Worf/Troi relationship, which was left unexplained on screen.

...
Wikipedia