Kolchak: The Night Stalker THEY HAVE BEEN, THEY ARE, THEY WILL BE S1 E03 ABC TV Sept 27, 1974

Kolchak: The Night Stalker THEY HAVE BEEN, THEY ARE, THEY WILL BE S1 E03 ABC TV Sept 27, 1974
My personal favorite, in which Kolchak connects bizarre thefts done by a powerful invisible entity targeting metal ore and ingots to a series of suspicious animal & human deaths in which the victims' bone marrow is missing.