Source Code is a great sci-fi movie which explores travels on time and parallels realities through a very simple premise, but never ceasing to be puzzling and intriguing. The scriptwriter, Ben Ripley, doesn't make many ceremonies to quickly explore the pretext of the repetition of the narrative, discovering the mechanisms of the pump or by placing the characters off the train. Some parallel actions, such as the gun, end up having less potential, but they don't undermine the progress of the narrative. Too bad the ending is sugar water, that need to deliver a happy ending to leave the viewer satisfied at the end, which is not always necessary. It is still an above well average film, engaging, dynamic and efficient.
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