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From Trekipedia
The Keeper (TOS 00)
- Stardate Unknown: The U.S.S. Enterprise NCC-1701 follows a distress signal to the planet Talos IV, where Captain Christopher Pike is taken captive by a group of telepathic aliens. (TOS 00)
- Upon Captain Pike's recommendation, Talos IV is quarantined by the Federation under General Order 4. (TOS 15)