7 spoilers for the movie Harry Potter and the Prisoner of Azkaban
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Sirious is Harry's godfather. Also he is in the marauders.
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The rat escapes.
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Sirius Black is Harry's godfather. Ron's rat is the bad guy. Lupin is a werewolf.
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The prisoner they fear is actually the good guy. The pet rat is the servant of the Dark Lord
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Sirius is good!
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Sirius Black is Harry's Godfather
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Pettigrew, Black and Lupin were Harry's father Best friends