user: Question: What episode  number of the series aired on February 26, 1968?
Columns: ['Series #', 'Season #', 'Title', 'Director', 'Writer(s)', 'Airdate']
Types: ['real', 'real', 'text', 'text', 'text', 'text']
Sample row: [439.0, 1.0, '" The Wreckers "', 'Robert Totten Category:Articles with hCards', 'Hal Sitowitz Category:Articles with hCards', 'September 11, 1967']
SQL:

assistant: SELECT "Series #" FROM "Table" WHERE "Airdate" = 'February 26, 1968';