When La'An tests a prototype holodeck with a fictional case only she can solve, the consequences of failure get greater and greater, with the Enterprise hanging in the balance.

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

Paul Wesley (Maxwell Saint)

Chris Myers (Ensign Dana Gamble)

Rong Fu (Lt. Jenna Mitchell)
Kira Guloien (Agonyan)

• Paul Wesley (James Kirk) appears as actor Maxwell Saint, the overly dramatic star of the fictional TV series "The Final Frontier", doing his best William Shatner impersonation.
  
• Scotty recommends the holodeck be removed from Enterprise, and in the future would need to have its own computer core and power supply. This is how it operates in the Next Generation/Voyager timeline.