There is little doubt that the premiere episode of Star Trek: Picard had several major bombshells that most people were not expecting. For instance, it was revealed why Jean-Luc Picard decided to turn his back on Starfleet. Interestingly, it's an issue that's connected to the 2009 film's villain Nero.
WARNING: The following contains spoilers from Star Trek: Picard Season 1 Episode 1. Proceed with caution.
In Remembrance, Picard is interviewed by the Federation New York on what happens to be the anniversary of the destruction of Romulus. During the exchange, it is revealed that although Picard launched an evacuation of the planet, this was interrupted by synthetic lifeforms suddenly going rogue. Unfortunately, this led to Starfleet abandoning the mission, leaving millions of Romulans dead.
Not surprisingly, Picard was upset with what Starfleet did and he points out that this was the reason why he decided to leave in the first place. He plainly states that he simply could not continue being a part of an organization that made the fall of Romulus possible.
"We withdrew. The galaxy was mourning, burying its dead, and Starfleet slunk from its duties. The decision to call off the rescue and to abandon those people we had sworn to save was not just dishonorable - it was downright criminal! And I was not prepared to stand by and be a spectator!" Picard declared.
In the 2009 film, it was revealed that Nero went back in time to take revenge on Starfleet for the annihilation of his people. Although his backstory was not given too much thought, it is still good to know that the new series has a clear explanation of his actions.
Star Trek: Picard airs on CBS All Access every Thursday nights.