Warning: the following contains SPOILERS for Star Trek: Picard.
Star Trek: Picard pits Jean-Luc (Patrick Stewart) once more against the machinations of the extra-dimensional being known as Q (John de Lancie), and this time, Q is apparently aided by a so-called "Watcher". While Star Trek's alternate realities or histories typically run parallel with the Prime Universe – such as the Mirror Universe or the Kelvin Timeline – Q's meddling instead changes all of Star Trek history within the Prime Universe itself. Although Q's appearance in Star Trek: Picard season 2, episode 1 “The Star Gazer” is a surprise, the series has been reintroducing fans to many of the classic characters from the franchise since season 1. Even though very little is known about the Watcher, it's likely to be someone from Picard's past.
In Star Trek: Picard season 2, the crew find themselves trapped in an alternate Earth ruled by the fascist and xenophobic Confederation of Earth instead of the United Federation of Planets. Despite this, Q has preserved the Prime Universe memories of Picard and his crew, which now includes the Borg Queen (Annie Wersching) herself. In a strange development that could forever change thefuture and evolution of Star Trek's Borg in the Prime Universe, the Borg Queen is recruited into Picard's motley crew, functioning both as the crew's chief computer scientist and mad alien prophet. Thanks to the Borg Queen's cross-temporal awareness, she deduces that Q's changes to the Prime Universe are rooted in a single temporal recession in Los Angeles in the year 2024. The Borg Queen also tells Picard that Q was not alone – “There is someone there to help, a Watcher. Seek the Watcher.”
Related: Picard Hints The Borg Really Will Join The
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