Aired: February 26, 1970 | Season: 2 | Episode: 23

Overview
Runtime: 60m
Directed by: Leonard Freeman, Marvin Chomsky
Written by: Anthony Lawrence
Guest stars: Bernard Ching, Dana Elcar, Ed Flanders, Elizabeth Smith, Fred Titcomb, H.M. Wynant, Karl Swenson, Ken Drake, Loretta Swit, Lynne Ellen Hollinger, Yankee Chang
Description
Dr. Alexander Kline, a biological scientist, views his work as evil, and to prove it, he plans to unleash a deadly germ that would kill thousands. Three dead cows lead McGarrett on a desperate chase to track down the toxin, involving a friendly telephone operator and top Washington agents.