Voyage to the Bottom of the Sea (1964)

S4E21 Savage Jungle

An alien jungle is rapidly spreading throughout Italy, and soon it infiltrates the Seaview, aided by a crew member who is actually an alien spy. The Admiral has constructed a device that could be key to stopping the invasion, but he and Crane must navigate through the overrun corridors first. Their mission is critical: they need to thwart the launch of missiles intended to extend the alien infestation even further. * Patrick Culliton portrayed several crew members during the four seasons of Voyage.