Tonight is the night I'm going to alienate myself from the Beasties - because I found "Never Turn Back" to be the most underwhelming episode since we found ourselves fighting our way through the return of Vincent's past red-haired love interest.
There was one relatively (pun!) unique reveal in the finale and the rest was fairly straightforward.
It turned out that Vincent didn't need to take more pills to be cured because the pill that Tyler synthesized using a combination of the ones left over from Cat's mom and information she stole from Muirfield created a perfect destruction tool against Vincent's animal DNA. He was being cured without his body ingesting further toxins.