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Ratings for Supernatural's 'The Thing' from Programming Insider
Live +7 Day Ratings
L+SD - 0.44
L+7D - 0.84
Total Increase 0.40
Percent Increase -  +39.00%
Total Viewers
L+SD - 1.444M
L+7D - 2.411M
Total Increase - 0.976M
Percent Increase - 66.97%
Live + 3 Day Ratings  from Programming Insider
L+SD - 0.4/2
L+3D - 0.7/3
Percent Increase - 75.00%
Total Viewers
L+SD - 1.444M
L+3D - 2.161M
Total Increase - 0.717M
Percent Increase - +49.65%
Final Same Day Ratings from TvByThe Numbers
18-49 - 0.4/2
Total Viewers - 1.41
That's quite a drop from the overnight numbers below. The CW was preempted in New York, other than that, I haven't seen any reason why the change was so large. Many shows were in repeat this week with only Supernatural, Legends of Tomorrow, Black Lightening, Arrow and and Life Sentence being new thus far.  Of those shows, only Black Lightening beat us in the 18-49 demo and Legends of Tomorrow tied us in the same demo. Basically it was a bad week for the CW all around.
We did make the Nielsen top 5 in social media
SPN Nielsen 5.4.2018
Initial ratings from Showbuzz Daily under the cut
Overnight Ratings
Fast Demo 2018 Apr 05.THU
We fell a bit from last week's heavily anticipated episode. TV Series Finale shows the change.
Change from last week 13 18
 For comparison, ratings for other episodes are here