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_23392257_4 (original_airdate VARCHAR, viewers__millions_ VARCHAR)
### Question:
What episode premier received 0.680 million viewers?
### Answer:
SELECT original_airdate FROM table_23392257_4 WHERE viewers__millions_ = "0.680"