Hepcat Chet is a vampire who appears in the episode "So, You Want to Be a Vampire?"

Francis Grimes believes that the vampires are responsible for the "Mad Larry Disease" outbreak in the city. He tells Mark Lilly that Hepcat Chet stocks medical supplies for the vampires. Chet works with Katrina and Johnny Three Fangs.

As it turns out, the medical supplies are only for Blake's father's medical research on the cure for the disease.