Dexter Morgan is a vigilante serial killer in his spare time, targeting other murderers.
 Dexter soon finds that the murders are being committed by two people: a fanatically religious college professor named James Gellar (Edward James Olmos) and his protg, Travis Marshall (Colin Hanks)
 Dexter follows a code of ethics taught to him in childhood by his adoptive father, Harry, which he refers to as "The Code" or "The Code of Harry" and hinges on two principles: He can only kill people after finding conclusive evidence that they are guilty of murder, and he must not get caught

