The episodes that are viscerally seared into my mind are:
187: Oded the Merciless
I think this might have been my first experience with hard core body horror which probably explains why I'll never get the image of walking on bone spurs out of my head
"what makes you tick" from Flash On The Borderlands VII
the voice is forever in my mind even now 10 years later.
More recently 651: the coven of dead girls
The story and the telling hit me hard and I just had to stay in silence and process for a while, I loved it.