Ambassador Class Star Ships
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U.S.S. Adelphi NCC-26849
The U.S.S. Adelphi carelessly violates cultural taboos while attempting first contact with the planet Ghorusda. Forty seven crew members, including the Adelphi's Captain Darson, are killed during the incident, which becomes known as the Ghorusda disaster. A Starfleet Board of Inquiry blames Darson and Betazed mission specialist Tam Elbrun, for the failure.
U.S.S. Excalibur NCC-26517
The second Starfleet vessel to bear the name U.S.S. Excalibur, this vessel forms part of a non-aggressive armada stationed along the Neutral Zone border during the Klingon civil war. Commander William Riker, of the U.S.S. Enterprise D, serves as the Excalibur captain, Geordi La Forge is his first officer.
U.S.S. Enterprise NCC-1701-C
The fourth Federation vessel to bear the name U.S.S. Enterprise, this ship is presumed lost with all hands after an incident near Narendra III, in 2344. Twenty two years later, the Enterprise, commanded by Captain Rachel Garrett, emerges from a temporal rift, significantly altering the course of history. The Federation is now losing a long conflict with the Klingon Empire, and Starfleet vessels are warships. The timeline is restored when Garrett's ship returns to its own era.

U.S.S. Exeter NCC-14598
Starfleet officer Thomas Eugene Paris serves aboard the second U.S.S. Exeter during the early part of his career.
U.S.S. Gandhi NCC-26632
In 2361, an exact replica of William T Riker is created during a transporter accident on Nervala IV. Adopting Riker's middle name of Thomas, his duplicate decides in 2369 to remain with Starfleet. He joins the U.S.S. Gandhi for a terraforming mission in the Lagana sector. Thomas Riker stays with the Gandhi for just over a year, before defecting to the outlawed paramilitary organization the Marquis.
U.S.S. Horatio NCC-10532
In 2364, Walker Keel, captain of the U.S.S. Horatio, begins to suspect Starfleet Headquarters has been infiltrated by unknown enemies. He also fears his first officer on board the Horatio has become part of the conspiracy. Among others, Keel contacts his old friend, Captain Jean-Luc Picard of the U.S.S. Enterprise D, to warn him of this threat to the Federation. Picard is initially doubtful, but he is convinced of the truth when the Horatio is destroyed by an unknown alien intelligence near planet Dytallix B.
U.S.S. Valdemar NCC-26198
On Stardate 47944, Deep Space Nines's Chief O'Brien is abducted by a Cardassian patrol ship and taken to Cardassia, where he stands public trial for allegedly supplying the Marquis terrorist group with illegal weapons. Following O'Brien's arrest, the U.S.S. Valdemar is dispatched to the border of the Federation-Cardassian Demilitarized Zone,
U.S.S. Zhukov NCC-62136
In 2366, systems diagnostic engineer Reginald Barclay transfers from the U.S.S. Zhukov, commanded by Captain Gleason, to the U.S.S. Enterprise D. The Zhukov joins the Enterprise again the next year, for the transfer of Federation ambassador T'Pel, who turns out to be a Romulan defector. The Zhukov also transfers several science teams to the Enterprise in preparation for the latter ship's mission at the Phoenix Cluster in 2368.
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