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The Perseus arm was a region of Mutter's Spiral where Mogar was located. (TV: Terror of the Vervoids)
In 3046, the Kustollons of Kustollia fought the humans of Earth in an "enormous, terrible battle" over disputed territories in the Perseus arm. The humans won using a virus developed from Peter and Charlotte Cobb's research which disabled the Kustollons' biotechnology. (COMIC: The Love Invasion)