Hawaii Five-O (1968)

S2E23 Three Dead Cows At Makapuu (1)

Dr. Alexander Kline, a biological researcher plagued by his own moral dilemmas, sets out to demonstrate the malevolence of his research by releasing a lethal pathogen that could claim countless lives. The discovery of three lifeless cows sends McGarrett on a frantic mission to trace the source of the toxin, enlisting the help of a helpful phone operator and high-ranking officials from Washington.