Burnham is stunned when she learns her ties to Section 31 run deeper than she ever fathomed. Armed with the identity of the Red Angel, the U.S.S. Discovery goes to work on its most critical mission to date.

Sonequa Martin-Green (Commander Michael Burnham)
Doug Jones (Commander Saru)
Anthony Rapp (Lt. Cmdr. Paul Stamets)
Mary Wiseman (Ensign Sylvia Tilly)
Shazad Latif (Agent Ash Tyler)
Wilson Cruz (Dr. Hugh Culber)
Anson Mount (Captain Christopher Pike)

Michelle Yeoh (Philippa Georgiou)

Jayne Brook (Admiral Katrina Cornwell)
Ethan Peck (Lieutenant Spock)
Alan van Sprang (Captain Leland)
Sonja Sohn (Gabrielle Burnham)
Rachael Ancheril (Commander Nhan)

Hannah Cheesman (Lt. Cmdr. Airiam)
Emily Coutts (Lt. Keyla Detmer)
Patrick Kwok-Choon (Lt. Gen Rhys)
Oyin Oladejo (Lt. Joann Owosekun)
Ronnie Rowe Jr. (Lt. Ronald Bryce)
Sara Mitich (Lt. Nilsson)
Jason Anthony (Control Computer)

• Tilly discovers the bio signature of the Red Angel matches Michael Burnham.
  
• Leland tells Burnham that her parents were working on Project Daedalus for Section 31. Leland obtained a Klingon time crystal, needed to power the suit, but was careless and the Klingons found it on Doctari Alpha, where they murdered Burnham's father. Her mother was presumed dead, but managed to escape in the time suit, which sent her 950 years into the future.
  
• While attempting to use a retinal scanner, it injects Leland's eye with nanobots, and Control takes over.
  
• Lt. Nilsson takes Airiam's place at the spore drive operations station on the bridge. Sara Mitich previously portrayed Airiam throughout Season 1.