USS Endeavor (NCC-1001)

The USS Endeavour (NCC-1001) was a Constitution-class Federation starship in service in the 23rd century.

During the mid-2250s, the Endeavour was enroute to Starbase 14, when they mysteriously disappeared in the Theta Eridani system. The starship was eventually discovered by the USS Enterprise in 2273, and they learned that the Endeavour 's crew had been killed when the combined consciousness of a lost transporter research team took control of the starship's systems. (TOS comic: Experiment in Vengeance).