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back when he was very popular did michael bergin ever star in a movie that takes place on post apocalypse earth
 very popular, michael bergin, post apocalypse
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: genre, year, plot, average ratings, actor, title, song, character, rating, review, director, trailer 
Text: {0} 
Answer:
 very popular, michael bergin, post apocalypse