Hellsing is a 13-episode anime, based on the manga of the same name by Kouta Hirano. The anime is produced by studio Gonzo and was broadcast from October the 10, 2001 until January the 16, 2002 on The National Japanese television Fuji. The anime is given license by Geneon and released on the American market.
Interesting in that anime is that it isn’t following the manga and has rather commercial purpose of the Hellsing trade-mark. That kind of commercial is very common in Japan. The demographic type in Hellsing is Seinen, or said in a different way- for people above 18 (this genre is mostly for 18- 30 year old audience). The characters are also not the same as in the manga. The plot of the anime is nothing special, maybe because it’s not following the manga. The story is about the Hellsing organization and the vampires Alucard and Seras Victoria. This organization protects Her Highness and all the people from vampires and other supernatural threats. The anime is full with very good action and is not engaging. I recommend you to watch it, at least for the characters in it. They have very impressing individuality.