Martian (The War of the Worlds) antagonists are the "squid-walkers", a cybernetic race of tripods controlled by a single entity inside their mothership. Inside the mothership, humans are kept alive and their blood is filtered, homogenised, and fed to the aliens. They are killed by infected blood injected into the mothership's core, telepathically shutting down the Tripods. In the film "H.G. Wells' The War of the Worlds", the Martians are large, bulkish creatures, keeping the two large eyes and tentacles described in the book; but do not seem to possess the beak-like mouth. They meet the same fate as the originals, having caught Earthly diseases. Their
The War of the Worlds suggests the Martians have left behind. The novel also presents ideas related to Charles Darwin's theory of natural selection, both in specific ideas discussed by the narrator, and themes explored by the story. Wells also wrote an essay titled 'Intelligence on Mars', published in 1896 in the "Saturday Review", which sets out many of the ideas for the Martians and their planet that are used almost unchanged in "The War of the Worlds". In the essay he speculates about the nature of the Martian inhabitants and how their evolutionary progress might compare to humans. He also suggests that Mars, being