Question: who plays krall in the new star trek
[{'answer': 'Idris Elba', 'provenance': [{'wikipedia_id': '43697026', 'title': 'Star Trek Beyond', 'start_paragraph_id': 1, 'start_character': 655, 'end_paragraph_id': 1, 'end_character': 665, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]