/a/ seems to be infected with Hellsing fever lately - and rightly so with the 4th OVA out. I've decided to jump on board.
Clue me in, anon. At what point in the original series does it begin to deviate from the manga? In before episode 1.
Around episode 5 or 6.
There are small differences even by episode 3 and 4, but after the mansion attack in episode 5 or so it really goes off on its own.