"Her Pilgrim Soul" was an episode of 'The Twilight Zone' from the mid-1980s in which Kevin Drayton and Daniel Gaddis made contact - via their experimental holographic technology - with the spirit of a woman who lived in the first half of the 20th Century.
Several times during the episode we saw signs that they were in the state of Massachusetts, and I think the inference was that they were working at MIT. The fraternity of scientists, in the grand scale of the general population, is a small one; so I think it would be highly probable (or as Mushrat would say, "It's pozz'ble, just pozz'ble.) that Drayton and Gaddis knew Walter Bishop twenty years ago when he was a younger man... and of course, before he got locked up in the St. Claire's mental institution.
The actors who played Drayton and Gaddis, Kristoffer Tabori and Gary Cole, respectively, have aged right along with those characters. So they could easily slip into those roles again for an episode of 'Fringe', one that might have something to do with reincarnation and virtual reality just as that 'Twilight Zone' episode did.
It won't happen, of course. But here at Toobworld Central, we "dream-view" television.....