Okay, finally got around to watching it, and thought it was rather disappointing. Kind of strange actually, because it was a fun episode and I'm totally on the Ed&Kelly back together train, but there was so much of it that just plain didn't make a lick of sense.
Strangely, I think I'm okay with the black hole part. Well, sort of. Though the shot of them looking at light and particles or whatever being sucked down into the middle of it didn't make a lick of sense. That does not compute. Since, you know, they were past the point where light could move outwards. They should not have been able to observe anything. But at least the general idea that if you have a ship that can go faster than light, then you can escape from somewhere that light cannot. On the face of it, that makes sense.
A lot of the rest of the episode, while fun and entertaining, just kept bothering me every few minutes when something else that didn't make sense would pop up again and again.
Also, without saying too much, I find myself wishing I would have watched it before watching Avengers Endgame.
I don't know. Like I said, I did quite enjoy most parts of it, it was a fun story. But it really fell apart as soon as you think about it for more than half a second. And while I understand that there are time limitations and cast limitations and whatnot, when I'm watching a science fiction show, sometimes I can only overlook so much.