CREATE TABLE table_28386 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT)

What was the airdate of k0120?
SELECT "Original air date" FROM table_28386 WHERE "Production code" = 'K0120'
SELECT "Original air date" FROM "table_28386" WHERE "Production code" = 'K0120'