A consultant arrives on the U.S.S. Cerritos to run drills that require the lower deckers and bridge crew to swap duties.

Tawny Newsome (Ensign Beckett Mariner)
Jack Quaid (Ensign Brad Boimler)
Noël Wells (Ensign D'Vana Tendi)
Eugene Cordero (Ensign Sam Rutherford)
Dawnn Lewis (Captain Carol Freeman)
Jerry O'Connell (Commander Jack Ransom)
Fred Tatasciore (Lieutenant Shaxs)
Gillian Vigman (Dr. T'Ana)

Alice Krige (The Borg Queen)

Marc Evan Jackson (Sickbay Nurse)
Phil LaMarr (Commander)
Lauren Lapkus (Ensign Jennifer Sh'reyan)
Jessica McKenna (Ensign Barnes/Cerritos Computer)
Lennon Parham (Shari yn Yem)
Ben Rodgers (Lt. Commander Steve Stevens)
Paul Scheer (Lt. Commander Andy Billups)

• A Pandronian, Ari bn Bem, previously appeared in the Animated Series episode "Bem".
  
• The holodeck drills are all based on previous Star Trek episodes, including "Mirror, Mirror", "The Naked Time", "Ethics", "The Best of Both Worlds", and the ending of Star Trek II: The Wrath of Khan.
  
• Several background characters are given names in the training roster, and the Andorian "Jennifer" is given the last name Sh'reyan.
  
• Lt. Winger Bingston Jr. was voiced by Eugene Cordero (Sam Rutherford).