How many Star Trek movies does Khan appear in?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q1092', 'id': 0, 'label': 'Star Trek'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q465478', 'id': 1, 'label': 'Star Trek II: The Wrath of Khan'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q23031', 'id': 2, 'label': 'Khan Noonien Singh'}, {'type': 'INTERNAL', 'name_': 'Q5251718', 'id': 3, 'label': 'Space Seed'}], 'links': [{'name_': 'P8345', 'source': 1, 'target': 0, 'label': 'media franchise'}, {'name_': 'P144', 'source': 1, 'target': 3, 'label': 'based on'}, {'name_': 'P8345', 'source': 3, 'target': 0, 'label': 'media franchise'}, {'name_': 'P5940', 'source': 3, 'target': 1, 'label': 'plot expanded in'}, {'name_': 'P674', 'source': 3, 'target': 2, 'label': 'characters'}]}