CREATE TABLE table_22998 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "U.S. viewers  ( millions ) " CLOB)

who write the episode 5 in no. in season
SELECT "Written by" FROM table_22998 WHERE "No. in season" = '5'
SELECT "Written by" FROM "table_22998" WHERE "No. in season" = '5'