Siegfried (sometimes known as "Count von Siegfried," "Colonel Ludwig von Siegfried," "Conrad Siegfried," or "Siegfried the Great") is a reoccurring antagonist in the 1965-1970 series Get Smart. He works as a high-ranking agent for KAOS, the international organization of evil. He considers Maxwell Smart a personal rival (and vice-versa - Max refers to Siegfried as his "old friend and bitter enemy").