On a remote science outpost, stone orbs are bringing fantasies to life. Tendi starts her first day as a Senior Science Officer Trainee.

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)

Susan Gibney (Dr. Leah Brahms)

Lauren Lapkus (Ensign Jennifer Sh'reyan)
Ben Rodgers (Lt. Commander Steve Stevens)
Carl Tart (Ensign Cor'dee)
Paul F. Tompkins (Dr. Migleemo/Ensign Young)
Baron Vaughn (Captain Maier)
Kari Wahlgren (Ensign Kearns)

• Dr. Migleemo is Tendi's science officer mentor, but it's Dr. T'Ana who actually helps her.
  
• Captain Maier is commander of the California-class U.S.S. Carlsbad. The lower deckers of the Carlsbad seemingly look down on the Cerritos, which has a reputation as joke with a crew who doesn't follow orders. (In reality, the Carlsbad lower deckers look up to the Cerritos crew.)
  
• Susan Gibney reprises her role as Dr. Leah Brahms, who appears as Rutherford's fantasy, trying to seduce him with Galaxy-class warp drives. (She first appeared as a hologram the Next Generation episode "Booby Trap".)
  
• Jennifer appears as Mariner's fantasy "hot Andorian girlfriend."