Jack (ジャック, Jakku) is an underground beyblader and a minor antagonist.
He was chosen to wield the invisible wind Bit-Beast, Sickle Weasel. He challenges Kai and severely hurts him as Kai is unable to see his Bit-Beast. Once Kai is able to see his Bit-Beast he summons Dranzer and destroys Sickle Weasel at the cost of damaging his own beyblade even further. The blade breaks into two pieces and Jack runs away screaming.
- By the way:
- His name comes from the infamous serial killer "Jack the Ripper".
- In the Metal saga there is a Jack in Metal Masters who also likes to cut things.