 Occasionally helping the Scooby Gang by providing them with information and/or combat assistance in exchange for cash or for the joy of fighting, but having no qualms about betraying them to such enemies as Faith and Adam.In Season Four, Spike was introduced to fill the antagonistic role that Cordelia had in seasons One to Three; as Joss Whedon explains on the DVD featurette, "All of our characters got to the point where they were loving and hugging, and it was sort of like, where's Cordelia?