Six months into her sentence, Burnham is on an unexpected prison transfer when an emergency forces her shuttle to be rescued by the USS Discovery. Spending several days on the ship, Burnham is ordered by its captain, the mysterious Gabriel Lorca, to assist with a scientific assignment. Burnham overhears Lieutenant Paul Stamets, an astromycologist who is leading the assignment, discuss an upcoming experiment with a colleague serving on another starship; Lorca is soon informed of an incident on the Discovery's sister ship, the USS Glenn, that has killed the entire crew.
Stamets leads a boarding party to investigate and finds the dead crew hideously twisted and malformed, as well as a group of Klingons that has been killed by an unknown creature. Lorca later asks Burnham to work for him, despite her sentence, explaining that he organized the circumstances that led her to him so she could help develop a new way to fly that could win the war she started. He also secretly has the creature transported aboard the Discovery.