Question: who was the voice of simon bar sinister
[{'answer': 'Allen Swift', 'provenance': [{'wikipedia_id': '13517882', 'title': 'List of Underdog characters', 'start_paragraph_id': 18, 'start_character': 16, 'end_paragraph_id': 18, 'end_character': 27, 'bleu_score': 1.0, 'section': 'Section::::Allies.:General Brainley.\n'}]}]