Deadly Cloud Voyage to the Bottom of the Sea : Season 3 Episode 25
TV-G (self-applied) ABC 52m int(0)
Aired: March 12th, 1967 @ 12:00 AM EST on ABC
A mysterious cloud is enveloping the Earth and causing massive Tsunami and other catastrophic environmental damage. Crane takes the flying sub in to find out the cause and is taken over by an evil alien. Once aboard, this alien tries to stop Nelson before he can destroy the cloud with nuclear weapons.