The upcoming chapter 680 of "Bleach" will reportedly see the arrival of Isshin and Ryouken. According to reports, the two will be able to cross a portal that they've created to get to Ichigo and Uryuu.

Fans theorize that Isshin and Ryouken will make use of a device that was given to them by Souken Ishida. The device will then be used to open a portal that will allow them to reach Ichigo and Uryuu. Ryouken's father had previously made use of the same portal to get away from Quincy's realm.

Ichigo and Uryuu are in a bit of a pickle, so the arrival of their respective fathers may play a pivotal role in their success. It is believed that once Isshin and Ryouken reach their sons, they will then assist them in the battle. Isshin will apparently make use of his Bankai and Ryouken may have something prepared himself.

In the previous chapter, Ichigo and Uryuu found themselves at odds with Yhwach and Hashwalth, respectively. Yhwach proved to be a tough contender for Ichigo, causing the latter to almost admit defeat. Ichigo already had Inoue's shield and a new Bankai, but it still didn't help. Uryuu was also having difficulty overpowering Hashwalth.

Yhwach is not an easy opponent to beat—he can control and change the future. Ichigo will have to use everything in his power, along with the aid of Inoue and his father, to take down Yhwach. Many believe that Isshin will play a crucial role in the upcoming chapter. On the other hand, Ryouken will come to Uryuu's rescue and help his son in his clash against Hashwalth. Uryuu's Antithesis may save them both after all, according to reports.

Things are definitely heating up on "Bleach" and fans can barely wait for the new chapter to be released. It remains to be seen if Ichigo and Uryuu will win their respective fights or if Isshin and Ryouken will really arrive to help their sons.