Picard grapples with an explosive, life-altering revelation, while the Titan and her crew try to outmaneuver a relentless Vadic in a lethal game of nautical cat and mouse. Meanwhile, Raffi and Worf uncover a nefarious plot from a vengeful enemy Starfleet has long since forgotten.

Patrick Stewart (Admiral Jean-Luc Picard)
Jeri Ryan (Commander Seven of Nine)
Michelle Hurd (Commander Raffi Musiker)
Ed Speleers (Jack Crusher)

Michael Dorn (Captain Worf)
Jonathan Frakes (Captain William T. Riker)
Gates McFadden (Dr. Beverly Crusher)
Marina Sirtis (Deanna Troi)

Todd Stashwick (Captain Liam Shaw)
Amanda Plummer (Captain Vadic)
Ashlei Sharpe Chestnut (Ensign Sidney La Forge)
Thomas Dekker (Titus Rikka)

Allison Acosta (Ensign Vesco)
Stephanie Czajkowski (Lieutenant T'Veen)
Joseph Lee (Lt. Matthew Arliss Mura)
Chad Lindberg (Ensign Eli Foster)
Jin Maley (Ensign Kova Rin Esmar)
Tiffany Shepis (Dr. Ohk)
Luis Avilez (Security Officer)
Amy Earhart (U.S.S. Titan Computer)
Jermain Hollman (Ensign in Sickbay)
Grace Lee (S.S. Eleos Computer)
Dean Neistat (Guard)

• In a flashback to 2381, Riker and Picard toast to the birth of Riker's son Thaddeus. The title refers to Thad's birth and the seventeen seconds it took for the turbolift to take Riker to sickbay after getting a call that there was a problem. After Jack is attacked and taken to sick bay, Picard goes through the same experience. (Patrick Stewart and Jonathan Frakes appear to have a de-aging filter applied.)
  
• Worf and Raffi discover Titus Rikka is the one who stole the weapon from Daystrom, but they surmise it was a distraction for something else that was stolen. Worf recognizes that Titus Rikka is a changeling who is struggling to hold his solid shape.
  
• Worf always calls Raffi by her full first name, "Raffaela."
  
• Ensign Foster is revealed to be a changeling. He sabotaged the Titan, allowing Vadic to track them.
  
• Seven has a model of the U.S.S. Voyager in her quarters.
  
• When Ensign La Forge talks with Seven privately, she calls her "Commander Seven."
  
• Deanna Troi appears in the flashback, on a comm call to Riker.