Hawaii Five-O (1968)

S2E24 Three Dead Cows At Makapuu (2)

Dr. Kline finds himself in a dilemma as his lethal toxin goes missing, causing him to reconsider his dangerous scheme. Meanwhile, McGarrett races against time to locate the vial before it deteriorates and threatens to contaminate the entire island. The toxin's grim effects are already manifesting, as unsuspecting individuals unknowingly come into contact with it, heightening the urgency of the situation.