The citizens of Stratos, the cloud city, are amazed by the gas masks Kirk & Mc Coy give them. And of the theory of invisible gases in the caves. Yet, cloud city citizens are able to materialize & dematerialize persons to, from & about Stratos under their own technology. They show no impression at witnessing Kirk & Spock materialize on their promenade. And they have ray guns, energy torture apparatie & live on a perpetually floating vast city comprised of towering skyscrappers. They are celebrated philosophers, artists & scientists. Rivaling even VULCAN.