"A Mysterious Beauty Appears! Mystery of Tien's Dojo?!" (現れた謎の美女! 天津流道場の怪!? Arawareta nazo no bijo! Tenshin-ryū Dōjō no kai!?) is the eighty-ninth episode of Dragon Ball Super. Its Japanese air date is May 7, 2017.
Goku heads to Master Roshi's island, where Oolong informs him that Tien and Chiaotzu have started a martial arts dojo, and that Roshi has headed there to act as a special instructor. Goku decides to make Tien the tenth member of the team, and heads off to recruit him and Roshi. At Tien's dojo, a woman named Yurin with a grudge against Tien arrives and requests to join the dojo. Although Tien denies her because her motivation of beauty was unfit for his dojo, Roshi drags Yurin off to ogle her. Goku arrives and asks Tien to join the Tournament of Power, but, even after Goku bribes him with 10 million Zeni, Tien refuses. Yurin escapes Roshi's advances and uses witchcraft to drive Tien's students on a rampage throughout town. Goku, Tien, Chiaotzu, and Roshi arrive at the village, where Yurin confronts them. Yurin explains that she is a former classmate of Tien's during his time at the Crane School and that she swore revenge on him after he left the school and refused to fight her. Meanwhile, Cabba sways Caulifla into joining Universe 6's team by promising to teach her how to become a Super Saiyan. Back in Universe 7, while Goku, Chiaotzu, and Tien cure the students of their brainwashing, Roshi battles Yurin. He lowers his guard after catching a glimpse of Yurin's panties, which allows her to brainwash him. The brainwashed Roshi quickly defeats Tien, but Goku intervenes. While Chiaotzu temporarily disables Yurin, Goku subdues Roshi with a Kamehameha and cures him of the brainwashing. Tien orders Yurin to apologize to everyone she hurt and offers her a place at his dojo. Tien decides to join the Tournament of Power because he believes that the 10 million Zeni Goku promised will repair the village. After hearing about the 10 million Zeni, Master Roshi quickly agrees to join as well.
- Goku, Tien Shinhan, and Chiaotzu vs. Tenshin-Style Dojo students (Yurin's witchcraft)
- Master Roshi vs. Yurin
- Tien Shinhan vs. Master Roshi (Yurin's witchcraft/Base/Max Power)
- Goku vs. Master Roshi (Yurin's witchcraft/Max Power)
- Script - Yoshifumi Fukushima
- Storyboard - Kazuhiro Ochi
- Episode Director - Hideki Hiroshima
- Animation Supervisor - Joey Calangian, Hirotaka Nii, & Koji Nashizawa
- Key Animators - Hong Beom-seok, Hironori Sawada, Shoichi Funaki, Tatsuya Oka, Takenori Tsukuma, Masato Ikeda, Koji Nashizawa, TAP
- 2nd Key Animators - Hirotaka Nii, Mido Douga, Yong-ce Tu, Mua Tsukino, Rieko Sugawara, Miyuki Yokoyama