The Wild Wild West (1965)

S4E23 The Night of the Plague

Title: The Plague's Shadow Plot: West faces the urgent situation of the Governor's daughter being abducted, while Gordon hurries to locate Jim to administer an antidote for the illness one of the kidnappers has. This outbreak becomes a pivotal moment in the ongoing battle between law enforcement and the criminals. Gordon persuades the gang to surrender in return for the necessary treatment to combat the disease.