|Owner:||United Federation of Planets|
A year later, the Excalibur was assigned to a fleet war games exercise pitting four starships against the USS Enterprise, 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. (TOS: "The Ultimate Computer")
|USS Ahwahnee • USS Constellation • USS Defiant • USS Eagle • USS Emden • USS Endeavour • USS Enterprise • USS Enterprise-A • USS Excalibur • USS Exeter • USS Hood • USS Intrepid • USS Korolev • USS Lexington • USS Potemkin • NCC-1700 • NCC-1707 • Unnamed|
|Mirror universe: ISS Enterprise|
|Alternate timeline: USS Enterprise|
The registry of the Excalibur was not confirmed until it was seen on the CGI model in the 2008 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.
According to the Star Fleet Technical Manual the registry of the Excalibur was NCC-1705.