Mirror Universe
(coexisting on another dimensional plane)
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This page contains information regarding Star Trek: Discovery, and thus may contain spoilers.

In the mirror universe, the Terran Defense Grid was the name for Terra's planetary defense system in the 23rd century.

In 2255, Captain Sylvia Tilly informed Emperor Philippa Georgiou that the ISS Discovery would go to maximum warp upon leaving the Terran Defense Grid. (DIS: "Terra Firma, Part 1")

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