He had once been inspired by the thought of creating a live-action police drama in which the hero would have unexpectedly been murdered halfway through the series and replaced by a new lead character.[30] Now giving fresh consideration to this idea, Anderson resolved that a selling point for his new series could be a character that can be killed at the end of each episode and resurrected by the beginning of the next. This, coupled with contemporary theories about the possibility of life on Mars,[31] led to the idea of an interplanetary war raging between Earth and its neighbour and a worldwide security organisation being called on to defend human civilisation. After further thought, Anderson decided that "Scarlet" would make an unusual codename for this organisation's "indestructible" agent who can come back to life, while "Blue" could be his partner's designation.