Kolchak connects a string of bizarre thefts committed by a powerful invisible entity that targets metal deposits to a string of suspicious animal and human deaths connected by the fact that the victims' bone marrow is missing.

Cast: Darren McGavin, Simon Oakland, James Gregory, Mary Wickes, Maureen Arthur, Dick Van Patten, Jack Grinnage, Carol Ann Susi, John Fiedler, Rudy Challenger, Phil Leeds, Len Lesser, Fritz Feld, Tony Rizzo, Dennis McCarthy