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Twonkus-3 is a huge comet that only comes near planet Earth once every year. This comet is a barren snowy landscape, a big source of Neutronium, and home of the Twonkies, Stompers, Gromps, and Monstros.

Jimmy Neutron and his robotic Dog Goddard had to come here for mineral supplies after braving an obstacle course of comet junk with their Neutronium Blaster.

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