Question: How many episode numbers are there on the show whose first couple was Stuart and Pegah>?
SQL: SELECT COUNT("#") FROM "1-25664518-4" WHERE "1st couple" = 'Stuart and Pegah';

Question: Who were the 3rd couple that were viewed by 4.89 million viewers? 
SQL: SELECT "3rd couple" FROM "1-25664518-4" WHERE "Viewers (millions)" = '4.89';