Voyage to the Bottom of the Sea (1964)

S1E13 The Blizzard Makers

Title: The Blizzard Makers Plot: Amidst an unusual blizzard hitting Florida, Nelson reaches out to a meteorologist who might shed light on the bizarre weather phenomenon. However, that evening, the scientist is kidnapped and coerced into becoming an assassin targeting Nelson. After his initial attempt to eliminate Nelson is thwarted, the meteorologist infiltrates the Seaview as it embarks on a mission to uncover the root of the disturbances, persistently pursuing his deadly objective.