While on a routine supply mission to colony planet Finibus III, the U.S.S. Enterprise comes under an attack from an unknown malevolent force. Pike brings all his heart and experience to bear in facing the crisis, but the security officer warns him that the enemy cannot be dealt with by conventional Starfleet means.

Anson Mount (Captain Christopher Pike)
Ethan Peck (Lieutenant Spock)
Jess Bush (Nurse Christine Chapel)
Christina Chong (Lt. La'an Noonien-Singh)
Celia Rose Gooding (Cadet Nyota Uhura)
Babs Olusanmokun (Dr. Joseph M'Benga)
Melissa Navia (Lt. Erica Ortegas)
Bruce Horak (Lieutenant Hemmer)
Rebecca Romijn (Lt. Commander Una Chin-Riley)

Geneviève Adam (Jennifer)
Angela Besharah (Professor Thandie)
Ava Cheung (Young La'an)
Kaylee Harwood (Lieutenant Parker)
Jennifer Hui (Ensign Christina)
André Dae Kim (Chief Kyle)
Atticus Mitchell (Ensign Todd)
Oscar Moreno (Crewman Zuniga)
Cameron Roberts (Manu Noonien-Singh)
Sophia Webster (Fig)

• The Gorn were introduced in the classic episode "Arena".
  
• La'an tells Pike it's the Gorn that is attacking them, though they are never seen and have no communication with Enterprise.
  
• It is Starfleet Remembrance Day, and many of the crew wear a pin commemorating a past Starfleet ship. Pike wears a U.S.S. Discovery pin. La'an has an S.S. Pugent Sound pin, but doesn't wear it and leaves it in her quarters.
  
• Spock mind melds with La'an to help her remember the Gorn attack when she was young. The Gorn are not shown, only heard. During the mind meld, La'an discovers Spock has a sister, a fact not included in his Starfleet record.
  
• Seven crew members lost their lives in the battle.
  
• "Memento Mori" is a Latin phrase translated as "remember you die" or "remember death".