The two hour season finale of Supernatural finished with a 0.8 adults 18-49 rating, down 20% versus its last original one hour episode two weeks ago.
The first hour had a 0.8 rating with 2.06 million viewers. The second hour had a 0.8 rating with 2.21 million viewers.
Supernatural was pre-empted in Chicago and won't be shown until May 22.
Source: TVBytheNumbers