Diane Haithman is contributing to Deadline’s coverage of TCA.

According to executive producer Kevin Williamson, there won’t be any guest crossover, or story crossover, between the CW’s The Vampire Diaries and the network’s new series The Secret Circle, making its debut Sept. 15. Even though both series are based on supernatural book series by the same teen-appeal author, L.J. Smith, Williamson told a TCA audience today that an effort is being made to keep the shows separate. The witch mythology of Secret Circle and the vampire-werewolf-occasional witch mythology of Vampire Diaries, he said, just don’t mix. “I don’t think you’ll see that crossover,” he said. “That would kind of limit us. We want to create our own story.” (more…)