Question: what is the saddest episode of supernatural?
Answer: 3 Dark Dynasty (10.21)
4 Do You Believe in Miracles (09.23) ... 
5 Sacrifice (08.23) ... 
6 Death's Door (07.10) ... 
7 Swan Song (05.22) ... 
8 Dark Side of the Moon (05.16) ... 
9 All Hell Breaks Loose (02.21) ... 
10 In My Time of Dying (02.01) ...