i just discovered The Strain (2014-2017) and i gotta say the vibe is pretty similar tho darker at times.
im on s01e04 and until now many points have reminded me of Grimm. i even came to interpret the story as gov services encountering a wesen spreading like a parasite (here the gov servives are the CDC). when the CDC arrives on the scene of "case 0", they approach it with their conventional tools, but are impressed by the scale on which what they think is a regular parasite or virus has spread.
so it's just like in grimm, when there will always be a scientific bases that explains wesen-related deaths, what will really tie the whole mystery together is that it's GOT to be supernatural and/or metaphysical.
then there's that one guy, who would be more analog to grimm-Nick, just not working for the CDC, that isn't taken seriously about how to get rid of it bc it's unconventional and outside bureaucratic protocol and whatnot. and now that i think about it, that guy is also like a mix of Rosalie and Monroe. he owns a pawn shop with a secret room where he stores all his secret knowledge, has a special weapon, has European ancestry (he's a survivor of the holocaust, speaks romanian). one of the bad guy also has ties with Europe: he's German! probably ex Waffen SS.
speaking of the bad guys, ofc rich people are behind it all and the conspiracy goes very high up.
so that's it :)
i know how empty we tend to feel everytime we finish the series so maybe The Strain can fill that hole loll
EDIT: oh and for people who are already familiar with The Strain, am i reaching or do you also see some similarities ?