Question: who did the justice league fight in the movie
[{'answer': 'Steppenwolf', 'provenance': [{'wikipedia_id': '44120383', 'title': 'Justice League (film)', 'start_paragraph_id': 1, 'start_character': 657, 'end_paragraph_id': 1, 'end_character': 668, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '44120383', 'title': 'Justice League (film)', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 1223, 'bleu_score': 0.935516955767805, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7770321321061156872}, 'section': 'Section::::Plot.\n'}]}]