If you missed it on Free Comic Book Day, here is the full issue that started it all for Spectrum.
...
A Texas ranger is drawn into a supernatural war and bestowed with a thousand-year life span after defeating a demon being pursued by an ancient Chinese warrior. For over one hundred years the gunslinger and the martial artist have hunted the creatures that secretly walk among us. If these two warriors can keep from killing each other, they just may save humanity itself.
Length: 94 pages
Author: Shannon Eric Denton
If you missed it on Free Comic Book Day, here is the full issue that started it all for Spectrum.
...