CREATE TABLE table_2468961_2 (no_in_series INT, original_air_date VARCHAR)

What episode number in the series originally aired on February 28, 1992?
SELECT MIN(no_in_series) FROM table_2468961_2 WHERE original_air_date = "February 28, 1992"
SELECT MIN("no_in_series") FROM "table_2468961_2" WHERE "February 28, 1992" = "original_air_date"