Who was the villain in The Dark Knight?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q159051', 'id': 0, 'label': 'Alfred Pennyworth'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q217533', 'id': 1, 'label': 'Joker'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q163872', 'id': 2, 'label': 'The Dark Knight'}], 'links': [{'name_': 'P7047', 'source': 0, 'target': 1, 'label': 'enemy'}, {'name_': 'P1441', 'source': 0, 'target': 2, 'label': 'present in work'}, {'name_': 'P674', 'source': 2, 'target': 0, 'label': 'characters'}]}