The U.S.S. Cerritos is dispatched on a mission where it ends up in a sci-fi event resulting in "strange energy," which Commander Ransom inadvertently absorbs.

Tawny Newsome (Ensign Beckett Mariner)
Jack Quaid (Lieutenant 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
Gillian Vigman (Dr. T'Ana)

Jonathan Frakes (Captain William Riker)

Eric Bauza (Cerritos Conn Officer)
Neil Casey (Ensign Casey)
Phil LaMarr (Starfleet Admiral Freeman)
Lauren Lapkus (Ensign Jennifer Sh'reyan)
Jessica McKenna (Ensign Barnes)
Randall Park (Apergosian High Leader)
Missi Pyle (Cardassian)
Ben Rodgers (Lt. Commander Stevens)

• Fred Tatasciore's name appears in the opening credits, but does not voice any major characters.
  
• This episode references Gary Mitchell from the classic Trek episode "Where No Man Has Gone Before".
  
• The "Starfleet Admiral" who was previously revealed to be Captain Freeman's husband and Mariner's father, is verbally named in this episode as Admiral Freeman.
  
• The background Andorian character is revealed to be the oft-mentioned "Jen".