Chapter 1

Dio the Invader (Prologue in the JoJonium release) is the first chapter of the JoJo's Bizarre Adventure manga. It is also the first chapter of Part I: Phantom Blood. Additionally, this chapter is categorized as a Prologue in the JoJonium release of the manga.

Summary
Between the 12th and 16th century, an Aztec ritual takes place in Mexico. A man wearing a stone mask sacrifices a young woman. Her blood spills onto the mask and tentacles sprout from the mask into the man's head. He screams to the audience that he has gained eternal life, and sacrifices a man next to him.

In the year 1881, a thief named Dario Brando, on his death bed, tells his son Dio of a debt that a man owed him. Back in 1868, a carriage accident had occurred which had been carrying a couple and their baby son. Dario and his wife saw the crash and decided to steal valuables from the corpses. The nobleman George Joestar had survived the crash, as did his son, but his wife had died. Thinking Dario had come to save him, George offered Dario a reward for his "help". Returning to the present, Dario tells Dio to live in the Joestar mansion in order to pay off George's debt. Not long afterwords, Dario dies and is buried. As a "goodbye", Dio spits on his father's grave.

In another area, two kids are bullying a small girl named Erina Pendleton by taking her doll. However, a young boy named Jonathan Joestar intervenes and helps the girl. While he gets beaten up by the bullies, he's able to get the doll back.

Soon after, Dio arrives at the Joestar mansion and meets Jonathan. Jonathan's dog, Danny, comes running towards them. Dio knees Danny in the jaw, enraging Jonathan. Dio thinks to himself that he must destroy Jonathan mentally in order to gain the Joestars' wealth.