As we reach the end of the series, more and more characters are getting their arc reaching an end.
The way Sapphie talks, with all her science shenanigans and all, has always given us some headaches, but she is a great character (as part of the main three) and I think they wrote her really good this season. Maybe a little too goofy, but that's also fine.
This episode has some really wild references, you will see.
Hope you can enjoy it before the year ends!