Question: who plays mr hyde on once upon a time
[{'answer': 'Samuel Stewart Witwer', 'provenance': [{'wikipedia_id': '2209127', 'title': 'Sam Witwer', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 21, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]