Sadako appears in the crossover film "Sadako vs. Kayako", encountering Kayako Saeki, the antagonist of the "Ju-On" films. Sadako's cursed videotape, in this version, is reduced to a 2-day deadline instead of the traditional 7 day deadline. She is also shown to be much stronger and violent this time, forcing people who try to hinder her curse or escape to kill themselves in brutal ways. The two ghosts battle each other to kill two women who are under both of their respective curses, they are lured to an old well with the help of psychics Keizo Tokiwa and Tamao in an attempt to destroy them both. However, it ends up causing the two ghosts to fuse into Sadakaya. Furthermore, prior to the battle and subsequent fusion, Sadako's curse is inadvertently transferred from the cursed videotape to the Internet, potentially causing her curse to be unleashed by anyone who watches it online.