Humphrey is a dog owned by Kevin Murphy. He played a "wolf" brought to Castle Forrester by Professor Bobo in the final host segment of Experiment 904 Werewolf. Humphrey had previously appeared in each of the author photos in The Amazing Colossal Episode Guide.
Kevin Murphy also relayed in a 2004 interview with Too Much Coffee Man magazine that he had accidentally scared Humphrey while testing out his home movie theater speakers.
- For a short time in 2008, Kevin submitted movie reviews on RiffTrax's official site using the alias of "Gumbo", his other pet. The theme of these reviews was movies which had pets as co-stars, including I Am Legend which Gumbo gave one out of four paws because the dog in that film did not having a happy ending.