Jimmy Neutron encounters a portal to an evil dimension and was switched places with Jimmy Negatron, who will bring evil inside the town of Retroville.Jimmy Neutron encounters a portal to an evil dimension and was switched places with Jimmy Negatron, who will bring evil inside the town of Retroville.Jimmy Neutron encounters a portal to an evil dimension and was switched places with Jimmy Negatron, who will bring evil inside the town of Retroville.