Question: what episode of legends of tomorrow is the crossover
[{'answer': 'Invasion !', 'provenance': [{'wikipedia_id': '52243241', 'title': 'Invasion! (Arrowverse)', 'start_paragraph_id': 60, 'start_character': 563, 'end_paragraph_id': 60, 'end_character': 573, 'bleu_score': 1.0, 'section': 'Section::::Reception.:Critical response.:"Arrow".\n'}]}, {'provenance': [{'wikipedia_id': '52243241', 'title': 'Invasion! (Arrowverse)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 721, 'bleu_score': 0.8040988046082881, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2078756114865972130}, 'section': 'Section::::Abstract.'}]}]