Carlos is the new guy on the FDNY. He works with Monte Parker, also known as Doc. Carlos causes alot of trouble at times, especially since he has started working with Alex Taylor. He is easily upset and sometimes stereotypes people. He is hard to get along with. He is always chasing girls. Carlos has dreams of becoming a doctor and is trying to balance his studies with his job as a paramedic Carlos Nieto is played by Anthony Ruivivar.