On Saturday ahead of Arts Alive, the annual Zombie Walk from Eureka's courthouse through the streets of Old Town brought out the undead. The loose  scrum of leg-dragging cannibals stopped to terrorize people in cars, wait for street lights to change and take selfies with the living. A few brave machete-wielding souls waded into the gory scrum but seem to have been overwhelmed.
Photographer Mark McKenna was on the scene documenting the brain-eating horde for the slideshow below. If you see any friends in there, remember: They're not your friend anymore.