The Life of the Stars
Summary
With the cadets struggling with their experiences, Ake calls in Sylvia Tilly to help bring them back together through the play Our Town. Tarima finally returns, but is transferred to Starfleet Academy and has trouble dealing with the changes. Tarima has an emotional meltdown and nearly leaves, but chooses to stay in the end as everyone comes closer together than ever. SAM's glitching threatens her life, so the Doctor and Ake take her to her homeworld Kasq in hopes that SAM's Makers can save her, but she is damaged beyond their ability to repair. The Doctor reveals that SAM reminds him of his daughter Belle and the Doctor has been trying to avoid making any more attachments to deal with the emotional pain of his infinite lifespan and the numerous losses that it carries.
Summary from Wikipedia, CC BY-SA 4.0.
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