A one time appearing character on the Venture Bros. show episode Dia de los Dangerous!, Dr. Ernesto Guevara is a medical doctor that resides in Tijuana. Dr. Venture solicited illegal prescriptions from him. However, the demands were so outrageous and illicit that Dr. Guevara rejected them out of hand, fearing for the loss of his license. Venture attempted to bribe Dr. Guevara with a hundred dollar bill, to which Dr. Guevara seemed to ponder. It is unknown if Guevara gave in and prescribed Venture the medications, but Venture is lying in a tub with a kidney stolen the next time he is seen in the episode, signifying that Venture must have become intoxicated some way or another.