The 13th cycle of Alley Cat Rescue's annual Feral Fix Challenge ran from March 15 through December 31, 2023, with record results. The Challenge is a global event that invites veterinarians to get involved with trap-neuter-return (TNR) by providing low-cost or free spay/neuter surgeries and rabies vaccinations for free-roaming cats. The goal of the Challenge is to save feral cats from shelter euthanasia, starvation, and disease by humane population management.