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Welcome to Memory Alpha!

Memory Alpha is a collaborative project to create the most definitive, accurate, and accessible encyclopedia and reference for everything related to Star Trek. The English-language Memory Alpha started in November 2003, and currently consists of 47,073 articles. If this is your first visit, please read an introduction to Memory Alpha.

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Where to watch: CBS All Access (US) • Space/Z (Canada) • Netflix (elsewhere worldwide)

Latest news

17 April 2019

Alison Pill, Harry Treadaway, and Isa Briones have been cast as series regulars for the upcoming Untitled Picard series. [1]

7 April 2019

The Star Trek: Deep Space Nine documentary What We Left Behind will be screened in theaters on May 13. Backers of the documentary will be able to watch the documentary on April 25. [2]

7 April 2019

Veteran character actor Seymour Cassel, who guest starred as Hester Dealt in TNG: "The Child", has died at the age of 84.

Upcoming episodes/films • Upcoming merchandise • Today in Trek history

Featured article

Operation Return was the combined Starfleet and Klingon Defense Force assault against the Jem'Hadar and Cardassian military forces in the Bajoran sector, launched in mid-2374. The objective of the mission was the recapture of starbase Deep Space 9, which had been captured by the Dominion in the opening battle of the war approximately five months previously. It is considered one of the more pivotal battles of the Dominion War.

In the opening months of the war the Federation suffered an almost unbroken series of defeats at the hands of the Jem'Hadar, and showed little capability of stopping and turning back the Dominion's all-out offensive. In addition, Starfleet's few attempts to mount counteroffensives, such as the Seventh Fleet's attack on the Tyra system, were met with overwhelming losses. Out of the 112 ships in the Seventh Fleet, only 14 survived the fight at Tyra and made it back to Federation lines. The Federation and her Klingon allies were unquestionably losing the war.