 <translate> The relevant information is: The fourth season began airing on October 10, 2017, on The CW. So the final answer is October 10 , 2017. <yor> Ìsọfúnni tó ṣe kókó ni: Àkókò kẹrin bẹ̀rẹ̀ ní October 10, 2017, lórí The CW. Nítorí náà ìdáhùn tí ó kẹ́yìn ni October 10, 2017. 