A Taste of Armageddon: World War fought by computers and disintegrator booths
For the World Is Hollow and I Have Touched the Sky: Hollow asteroid as a ship
The Enterprise Incident: Kirk and Spock attempt to steal a Romulan cloaking device
Mirror, Mirror: The Federation as an Evil Empire
The City on the Edge of Forever: Kirk and Spock go back in time to correct the time line.

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Keeper of the Jabberwock