326250
There are 6 missions to complete ( 8 in the Mega Drive version ) with several stages , and each mission has the player blasting aliens , from the streets to the mother ship , where the mother of all aliens can be found .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None