WARNING: This article contains SPOILERS for Star Trek: Picard season 3, episode 3, "Seventeen Seconds.
"Star Trek: Picard season 3, episode 3 ended with the surprise return of some classic villains, and a serious breakdown in the relationship between Admiral Jean-Luc Picard (Patrick Stewart) and Captain Will Riker (Jonathan Frakes) as the USS Titan-A faced catastrophe.
Directly following up Dr. Beverly Crusher (Gates McFadden) wordlessly confirming that Jean-Luc Picard was the father of Jack Crusher (Ed Speelers), "Seventeen Seconds" tackled how fatherhood affected both Riker and Picard's approaches to command as the Titan continued to evade the Shrike.
Another attack from Captain Vadic (Amanda Plummer) revealed the existence of a saboteur aboard the Titan, who had links to events on M'Talas Prime.
After rescuing Commander Raffi Musiker (Michelle Hurd) from Sneed (Aaron Stanford), Star Trek: Picard's Ferengi villain, Captain Worf (Michael Dorn) assisted Raffaela in apprehending another suspect named Titus Rikka (Thomas Dekker). Over the course of their good cop/bad cop routine, Worf and Raffi's interrogation Rikka revealed him to be a Changeling.
Star Trek: Deep Space Nine's Changelings as the villains of Picard season 3 makes more sense of Beverly's warning to "trust no one" in Picard's season 3 premiere, "The Next Generation".
This huge bombshell from the ending of "Seventeen Seconds" has much wider implications for the crew of the Titan and the other returning Star Trek: The Next Generation characters as Picard season 3 continues.
Once Titus Rikka was exposed as a Changeling, Raffi learned that Worf received intelligence about a schism within the Changelings' Great Link.