Question: who did brian blessed play in flash gordon
[{'answer': 'Prince Vultan', 'provenance': [{'wikipedia_id': '3978441', 'title': 'Flash Gordon (film)', 'start_paragraph_id': 4, 'start_character': 836, 'end_paragraph_id': 4, 'end_character': 849, 'bleu_score': 1.0, 'section': 'Section::::Plot.\n'}]}, {'provenance': [{'wikipedia_id': '3978441', 'title': 'Flash Gordon (film)', 'start_paragraph_id': 19, 'start_character': 0, 'end_paragraph_id': 19, 'end_character': 42, 'bleu_score': 0.6147881529512641, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10728564288668080826}, 'section': 'Section::::Cast.\n'}]}]