A few things
The new crewman didn't last long on the Seaview.
(They would get eaten,zapped, etc)
Admiral Nelson, and Captain Crane would get turned into zombies, or controlled
by aliens, about every other episode.
Finally, does anyone remember the episode where the giant creature has it's arms around the Seaview?
That model must have been huge.
"WE HAVE MET THE ENEMY AND THEY IS US"
POGO