Sylvia Tilly is an ambitious female Human Starfleet officer from Star Trek: Discovery, born in 2233 on Earth. Beginning as a cadet aboard the USS Discovery, she rose to serve as the ship's first officer and, after traveling to the 32nd century, became one of Starfleet Academy's most devoted instructors.
Tilly formed a close, lasting friendship with Michael Burnham and became the longest tenured Academy instructor in Starfleet history. This overview summarizes cited, source-based facts; consult the statements and Timeline for detail.
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