Lorca plans to move forward with a coup against the Emperor, propelling Burnham to make a quick decision to save not only herself, but the U.S.S. Discovery.

Sonequa Martin-Green (Specialist Michael Burnham)
Doug Jones (Commander Saru)
Shazad Latif (Lt. Ash Tyler)
Anthony Rapp (Lt. Paul Stamets)
Mary Wiseman (Cadet Sylvia Tilly)
Jason Isaacs (Captain Gabriel Lorca)

Michelle Yeoh (Captain Philippa Georgiou)

Rekha Sharma (Cmdr. Ellen Landry)

Emily Coutts (Lt. Keyla Detmer)
Jeremy Crittenden (Lord Eling)
Patrick Kwok-Choon (Lt. Gen Rhys)
Sara Mitich (Lt. Cmdr. Airiam)
Oyin Oladejo (Lt. Joann Owosekun)
Ronnie Rowe Jr. (Lt. Ronald Bryce)

• Lorca confirms was sent to the prime universe while transporting to the I.S.S. Buran during an ion storm while fleeing the I.S.S. Charon. (In the Original Series episode "Mirror, Mirror", the transporter accident occurred during an ion storm.)
  
• Mirror Landry kills Mirror Stamets now that his usefulness has worn out. Mirror Georgiou kills Lorca, but before Lorca's forces can overtake them, Burnham beams aboard Discovery, taking Georgiou with her.
  
• Discovery destroys the Charon's mycelial core, using it — along with the remainder of its spores — to travel back to the prime universe. They end up time jumping nine months later from their original departure.
  
• Shazad Latif (Tyler) does not appear in this episode.