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Earth is the third planet from the sun, the homeworld of Humanity and was chosen by the Martians as a suitable refuge for their escape from their own planet's decaying environment.

Though many of the bacteria in the atmosphere are harmless to humans extended contact proved fatal for the Martians.

1988 TV Show[]

When the Mor-Taxans invaded Earth, the very same bacteria only put them into hibernation rather than killing them.

Unlike in most versions, their goal is not to transform Earth to resemble their homeworld, but to conserve its natural state and reverse whatever damage had been done to its environment.