Excalibur (NCC-1664), U.S.S.

Star Trek: The Original Series
Episode: TOS 053 - Ultimate Computer, The

Consitution-class Federation starship, registry no. NCC-1664, commanded by Captian Harris. In 2268, the ship was destroyed and its entire crew killed during a disastrous war-game drill with Richard Daystrom's M-5 multitronic computer installed aboard the U.S.S. Enterprise.