Doctor Eggman Nega (often just referred to as Nega) is a mad scientist and villain from the Sonic the Hedgehog games. He first appears in Sonic Rush and is supposedly a version of Dr. Eggman from a parallel dimension, but later games have stated that he is actually Eggman's distant descendant (his exact place in the Robotnik family tree is unknown). He has served as the main antagonist of the Sonic Rush and Sonic Rivals games on the Nintendo DS and PSP respectively. He bears a striking resemblance to Dr. Eggman, but with angular sunglasses, a white moustache, a univisor goggle, and wears a black and yellow coat over a red jumpsuit. He is every bit the scientific expert as Eggman and even their robots are identical. However, what really sets the two Eggmen apart are their goals. Whereas Dr. Eggman wants to conquer the world, Nega wishes to destroy it. Many times, Nega has tried to bring about the destruction of the Sol Dimension through various schemes often involving the Sol Emeralds, but his plans are usually thwarted by Silver the Hedgehog and Blaze the Cat. Occasionally, Nega has allied with his ancestor Eggman to help him build the Eggman Empire, but other times has openly opposed him in order to fulfill his own mad ambitions to destroy the world. He is a very dangerous man, but shares the same disadvantages as Dr. Eggman, such as his childish tendencies to throw temper tantrums when things don't go his way.