Crippled, cornered, and out of options, Picard stages a gambit to trap Vadic and reveal her true motive — a gamble that puts the U.S.S. Titan in the crosshairs and forces Picard and Beverly to question every moral code they've ever held.

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

LeVar Burton (Commodore Geordi La Forge)
Jonathan Frakes (Captain William T. Riker)
Gates McFadden (Dr. Beverly Crusher)
Brent Spiner (Daystrom Android M-5-10)
Tim Russ (Captain Tuvok)

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

Mica Burton (Ensign Alandra La Forge)
Jenson Cheng (Shrike Lieutenant)
Stephanie Czajkowski (Lieutenant T'Veen)
Garth Kemp (The Face)
Joseph Lee (Lt. Matthew Arliss Mura)
Jin Maley (Ensign Kova Rin Esmar)

• The episode opens with Seven speaking with Tuvok, now a captain, about contacting Admiral Janeway. She realizes he has been replaced by a changeling when he didn't know it was Tuvok who had previously stabilized her neural pattern (in the Voyager episode "Infinite Regress").
  
• Vadic reveals she was held captive by Section 31 and tortured and experimented on as part of Project Proteus. To create the perfect spies, the scientist modified the changelings to pass blood tests, replicate internal organs, and hold their shape longer. Vadic was able to kill the scientist and took her shape. She is also able to pass on her abilities to other changelings.
  
• Michelle Hurd (Raffi Musiker) does not appear in this episode.