Warning: SPOILERS for Star Trek: Picard Season 3, Episode 5 – "Imposters"One detail about Jack Crusher (Ed Speleers) in Star Trek: Picard season 3 hints at the timeline of the Changelings' plan to attack Starfleet. Jack began having terrifying visions after he was exposed to deadly gas after he uncovered the USS Titan-A's Changeling saboteur in Picard season 3, episode 3, "Seventeen Seconds." Since then, Jack's waking nightmares have intensified as he visualizes an apocalyptic landscape, a door, blood-colored branches, and a voice urging Crusher to "find me."
At the start of Star Trek: Picard season 3, episode 5, "Imposters," Jack goes on a murderous rampage and slaughters the Titan's bridge crew before he snaps back to reality. But Crusher's waking life isn't any safer than his nightmares because security officers from the USS Intrepid led by Commander Ro Laren (Michelle Forbes) of Starfleet Intelligence come aboard the Titan to apprehend him. Commander Seven of Nine (Jeri Ryan) hides Jack in plain sight as a Starfleet Officer at the behest of Crusher's father, Admiral Jean-Luc Picard (Patrick Stewart). But after the Changelings posing as Starfleet security murder Ro, they return to the Titan, only to be taken down and terminated by Jack Crusher.