CREATE TABLE table_2586 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT)

If the production code is 6.18, what was the episode title?
SELECT "Title" FROM table_2586 WHERE "Production code" = '6.18'
SELECT "Title" FROM "table_2586" WHERE "Production code" = '6.18'