I could be wrong, but I seem to remember that they did not know if there would be an ex-wife/mother character when the show first aired in 1981. I think reviews were mixed after the first season. The audience had a hard time accepting Blake as both protagonist and antagonist. Yes, Cecil Colby could be seen as the antagonist/nemesis character, but he wasn't the kind of villain you love-to-hate as much as they needed him to be. When Alexis arrived, Blake's character was significantly softened. He was able to play more of a straight protagonist - hero, if you will - and Joan Collins stole the show as the show's antagonist while still evoking a sense of sympathy from the viewers. The rest is history. It was that new character and the change in Blake that made the show so popular for years to come.
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