While Sigmund is still in the underground caves to search for Olga , the military , who have discovered the Martian origin of the mutants , want to recover the spores and destroy the nest . A new expedition led by Colonel Rotkopf crosses the path of Nathan , Legs , May and Karen , back again in the caves to find Sigmund, Olga and Mike, now a mutant. The bottom of the cave seems to exert an inexplicable appeal on Martians
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