CREATE TABLE table_23855 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" CLOB, "Directedby" CLOB, "Writtenby" CLOB, "Originalairdate" CLOB, "Production code" CLOB, "U.S.viewers  ( million ) " CLOB)

What was the production code for the episode with 3.38 million viewers?
SELECT "Production code" FROM table_23855 WHERE "U.S.viewers (million)" = '3.38'
SELECT "Production code" FROM "table_23855" WHERE "U.S.viewers (million)" = '3.38'