On all my rewatches, I keep trying to find the perfect place to put this in season 1 so it doesn't feel out of place like it usually does.

I tried end of season 1, which is where the production numbers say it should go; that was a terrible idea. I tried late season 1 between episodes 17 and 18 (a suggestion I found on a reddit thread); that still felt way too late. On my latest try, I put it between episodes 13 and 14; this still feels too late for some reason. The episode doesn't reference any of the stuff that Fringe has been trying hard to get off the ground in the latter half of season 1, like Massive Dynamics, Olivia seeing John, her sister, Peter's murky past, etc.

In really trying to pay attention to the flow of season 1, I think this is really a very, very early season 1 episode before any of that starts to take off. I've decided to stick it between episodes 5 and 6 for my next watch and I think it'll go good there with the early simple monster-of-the-week episodes without any attachment to the larger plotline, which the very first few episodes don't really have.

If anyone watches it there for their next rewatch, let me know. I'm curious how it feels to someone else.

I like Belinda, but she was kind of mean to the Doctor at the end. Not wrong, but a little mean.

That ending, though!

When the Doctor argued with himself!! Best part of the episode! Laughed so hard I missed what they said and had to rewind twice!

Great ending to a two-parter, and the end of a season! Can't wait for Season 2!