The first episode drew 21 million viewers, the most for its time period in the national Nielsen household ratings.

"731" earned a Nielsen household rating of 12, being watched by 17.68 million people in its initial broadcast.

The show, which lasted over three hours, scored a 35.9 Nielsen household rating.

While the viewership was higher than previous season which average a 1.8 in Nielsen household ratings.

Part 1 earned a Nielsen household rating of 0.5 for 18/49.

Part 2 earned a Nielsen household rating of 0.4 for 18/49, being viewed by 1.601 million viewers.

This episode earned a Nielsen household rating of 0.4 for 18/49.

The episode earned a Nielsen household rating of 11.5, with a 16 share.

The episode earned a Nielsen household rating of 7.2, with a 12 share.

It earned a Nielsen household rating of 10.1, with a 14 share.

The first episode drew 21 million viewers, the most for its time period in the national Nielsen household ratings.

"731" earned a Nielsen household rating of 12, being watched by 17.68 million people in its initial broadcast.

The show, which lasted over three hours, scored a 35.9 Nielsen household rating.

While the viewership was higher than previous season which average a 1.8 in Nielsen household ratings.

Part 1 earned a Nielsen household rating of 0.5 for 18/49.

Part 2 earned a Nielsen household rating of 0.4 for 18/49, being viewed by 1.601 million viewers.

This episode earned a Nielsen household rating of 0.4 for 18/49.

The episode earned a Nielsen household rating of 11.5, with a 16 share.

The episode earned a Nielsen household rating of 7.2, with a 12 share.

It earned a Nielsen household rating of 10.1, with a 14 share.