170421
Again , Sonic 's nemesis Doctor Robotnik is planning world domination with his army of animals he 's placed into robots , and continues to seek the power of the seven Chaos Emeralds - this time , to construct his ultimate weapon , an armored space station known as the Death Egg .
 Sonic
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sonic