Tau Alpha C
Type:	Planet
Native Species:	Tau Alpha C natives
Location:	Tau Ceti system

Tau Alpha C was the homeworld of the humanoid species that The Traveler belonged to. (TNG: "Where No One Has Gone Before") It was located in the Tau Ceti system. (TNG: "Journey's End") Tau Alpha C was many months away from Federation Starbase 133 even at maximum warp speeds; at warp 9.5 it would take 123 days to reach the planet. (TNG: "Remember Me")

The Traveler, a native, visited the USS Enterprise-D crew in 2364, and he and Wesley Crusher worked together. (TNG: "Where No One Has Gone Before")

In an alternate universe created after Doctor Beverly Crusher became trapped within a warp bubble, Wesley tried to contact Tau Alpha C for assistance when individuals began disappearing from the Enterprise, with only Dr. Crusher noticing. Ultimately, the entire universe, including Tau Alpha C, disappeared. (TNG: "Remember Me")