Events
- Christopher Pike takes the USS Enterprise on her third five-year mission, and Pike's second as captain.
- 200 crewmembers of the Federation starship USS Farragut are killed at Tycho IV by a dikironium cloud creature. (TOS: "Obsession")
- The Shakespearian troupe Karidian Company of Players, sponsored by the Galactic Cultural Exchange Project, begins its tour of official installations. (TOS: "The Conscience of the King")
| 2256 | 23rd century 2250s |
2258 |