text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_1337525_1 (region_1 VARCHAR, region_4 VARCHAR, complete_series VARCHAR)
  ### Question:
  What is the region 1 where region 4 is tba is the complete eighth series?
  ### Answer:
  SELECT region_1 FROM table_1337525_1 WHERE region_4 = "TBA" AND complete_series = "The Complete Eighth Series"