1). First time, 4 and 6 - Molly Hooper and Rory Williams
This was a weird one. There was nothing left but skin - no muscles, no bones, no internal organs. Molly reached for the phone intending to call Sherlock, until she remembered she couldn't - he was dead to the world. She felt a pang of sadness, knowing he would have loved this case.
Just as she was exiting the morgue to grab a cup of coffee and a breather, a man with blonde hair, a big nose, and thick glasses that hid blue eyes, blocked the entry way.
"Oh," she said surprised.
"Oh, um, hello," he responded just as surprised as she was, "I didn't think anyone else would be here."
"Yeah, I just - " Molly tried, but instead asked, "Can I help you?"
"Uhh... yes. Yes, actually," he said, hesitant at first, but quickly deciding something, "I'm hear to see the body, errr, or skin of the body."
"Are you part of the investigation?"
"Ahh, yes. Dr. Rory Williams," he said, sticking out his hand, "I've been called in specially."
Molly smiled sadly, and shook his hand.
"Well, Dr. Williams. Right this way," she said, leading him over to the table. As they walked, Rory Williams asked, "Have you ever heard of the Slitheen?"