Zorro battles Dracula in one of the "original" stories.
I hope that they used a pseudonym. Dracula is in the public domain now, but Johnston McCulley, Zorro's creator, only died in 1958, so Zorro remains in copyright until 2028 in the EU. I have a horrible feeling that the rights are owned by Condé Nast, who are famously hard IP enforcers.