There is an episode of Star Trek where (off-screen, in the past) Starfleet and some scientist did some experiments on a super long-range transporter device. The inventor's son had gone through and ended up in some remote barren section of space with no stars, like a void. And not fully materialized back either. Pretty spooky stuff.
This is not like the few episodes where some crewmembers came out of the transporter phased the wrong way, and invisible. Those were fun episodes because they could walk through walls and spy without being seen.
The episode I'm talking about downright spooky because it happens in far away space and involves wandering essences.