Question: who plays greg in over the garden wall
[{'answer': 'Collin Dean', 'provenance': [{'wikipedia_id': '42145060', 'title': 'Over the Garden Wall', 'start_paragraph_id': 1, 'start_character': 468, 'end_paragraph_id': 1, 'end_character': 479, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '42145060', 'title': 'Over the Garden Wall', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 661, 'bleu_score': 0.981898582188057, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10174060671941310497}, 'section': 'Section::::Abstract.'}]}]