USS Excalibur (NCC-1664)

USS Excalibur (NCC-1664) was a Federation heavy cruiser that was in service with Starfleet in the mid-23rd century. In 2268, the Excalibur was commanded by Captain Harris.

In 2267, the Excalibur underwent a layover at Starbase 11. The ship's number was seen on a chart indicating the repair status of several vessels. 

A year later, the Excalibur was assigned to a fleet war games exercise pitting four starships against the USS Enterprise (NCC-1701), which was controlled by the revolutionary (but still experimental) M-5 computer. However, when the M-5 malfunctioned, it caused the Enterprise to fire phasers on the Excalibur at full power, when the ship's deflector shields were at minimum intensity. The Excalibur was severely damaged, with all hands lost. 

Excalibur personnel
See: USS Excalibur (NCC-1664) personnel

Background
The registry of the Excalibur was not confirmed until it was seen on the CGI model in the remastering of "The Ultimate Computer". Prior to that it had been seen without context on a list of starships in "Court Martial". The registry was first connected with the starship in the article The Case of Jonathan Doe Starship by Greg Jein and continued by the Star Trek Concordance and the Star Trek Encyclopedia, the latter edited by future TOS remastered producer Michael Okuda.

In the original version of the episode, a transposed image of the USS Constellation (NCC-1017) from was used to represent the Excalibur after the ship's destruction by M-5.

According to the Star Fleet Technical Manual the registry of the Excalibur was NCC-1705.

According to the Ships of the Line (page 64), the USS Excalibur was commissioned at Tranquility Base, Luna as a Starship-class ship.

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USS Екскалибур (NCC-1664) USS Excalibur (NCC-1664) USS Excalibur (NCC-1664) USSエクスカリバー(NCC-1664) U.S.S. "Excalibur" NCC-1664