CREATE TABLE table_51459 ("Episode" CLOB, "Air Date" CLOB, "Timeslot" CLOB, "Households  ( Rating/Share ) " CLOB, "18-49  ( Rating/Share ) " CLOB, "Viewers  ( m ) " FLOAT, "Weekly Rank  ( # ) " CLOB)

Tell me the episode with an 18-49 rating of 2.0/5
SELECT "Episode" FROM table_51459 WHERE "18-49 (Rating/Share)" = '2.0/5'
SELECT "Episode" FROM "table_51459" WHERE "18-49 (Rating/Share)" = '2.0/5'