Doom and Panther, yes. As to who else, I don't know. Anyone who was on the ship with Reed, mini-Reed in Secret Wars probably. I don't recall what Strange remembers and don't think I saw anything in his book to explain Secret Wars. I'm inclined to believe that ANYONE except Doom, Owen, and the folks on the ship were created by Doom or other dimensional duplicates. Not sure what the Richards family was as they appeared to be the originals at the end.
Johnny and Ben don't remember, but they know something happened.
My brain hurts and i don't wanna think this through. Just bring them back and gimme issue 646.