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_25800134_12 (series__number VARCHAR, airdate VARCHAR)
### Question:
What episode  number of the series aired on February 26, 1968?
### Answer:
SELECT series__number FROM table_25800134_12 WHERE airdate = "February 26, 1968"