CREATE TABLE table_1876825_3 (no_in_series VARCHAR2, original_air_date VARCHAR2)

What episode number in the series originally aired on February 25, 2001?
SELECT no_in_series FROM table_1876825_3 WHERE original_air_date = "February 25, 2001"
SELECT "no_in_series" FROM "table_1876825_3" WHERE "February 25, 2001" = "original_air_date"