Plot details about the “Waterworld” TV series are scarce, but Davis told Collider that it would take place 20 years after the events of the original film and follow the same characters. At the end of the movie, The Mariner, Helen, and Enola do find Dryland, implied to be the top of Mount Everest.
Presumably 20 years later, more people have flocked to Dryland. The Mariner, being particularly suited to aquatic living, may not be among them. As we saw in the film, life on “Waterworld” is primarily a fight for scarce resources. The folks with access to Dryland would be sitting pretty, but also in dire need of defense as news spread of their discovery.
“We’re not 100% sure on the approach to the show. But definitely, we’re in the building stages right now,” Davis’ producing partner John Fox said. Presumably that includes devising some new Big Bads for “Waterworld.” Even though Deacon and the Smokers exploded (and are therefore probably no longer an issue), there could be any number of roving pirate gangs who would love to take ownership of Dryland. We’ll just have to wait and see.