|This article or subsection has an associated category.||2285|
|years:||2282 2283 2284 2285 2286 2287 2288
|decades:||2250s 2260s 2270s 2280s 2290s 2300s 2310s|
|centuries:||22nd century - 23rd century - 24th century|
- The USS Constellation and the USS El Nath are lost due to time distortions. 
- The USS Gallant is assigned to patrol the Klingon Neutral Zone to prevent further Klingon incursions into Federation territory. 
- Stardate 8141.5: The USS Gallant is destroyed by a squadron of Klingon battle cruisers in Section 14 of the Gamma Hydra system. 
- Trill is admitted into the Federation. 
Promotions and transfers
- Following the death of Captain Spock, Lieutenant Saavik becomes chief science officer aboard the USS Enterprise. Shortly thereafter, she is reassigned to the USS Grissom, en route to study the Genesis Planet.
- Stardate 8218: Rear Admiral James T. Kirk is named temporary commanding officer of the USS Excelsior after recovering that vessel from the mirror universe. Commander Hikaru Sulu is assigned as his executive officer. Scotty, McCoy, Uhura, Chekov, Bryce, Konom, Bearclaw, Sherwood, Naraht, Morelli, Richardson, Kerasus and Saavik all join Excelsior as senior staff. 
- Captain Spock is named temporary commanding officer of the USS Surak after recovering from his fal-tor-pan. Commander Brinks is assigned as his executive officer. Chu-Sa, Garace, Mello, and McCarthy comprise his senior staff. 
Births and deaths
- Captain Carmen Ikeya and her entire crew are lost with the USS Constellation. 
- Del March, Vance Madison and the rest of the Regula I science crew are murdered by Khan, with only David and Carol Marcus surviving.
- Captain Clark Terrell commits suicide after being infested by a Ceti eel in his brain. 
- Spock, Peter Preston and many other Enterprise crewmembers die in Khan's attack. 
- Khan Noonien Singh, Joachim and their entire crew of augments are lost aboard the USS Reliant. 
- Excelsior Ensign Gillespie is murdered by Redjac.
- Saavik engages in a romantic relationship with David Marcus
- Stardate 8210.3: Saavik locates Spock on the Genesis Planet and aids him in Pon farr