Dragon Ball Super: Season 4, Episode 16

4 - 16: I Will Protect The World! Trunks Angry Super Power Explosion!!

Despite Future Trunks' power boost, he is only able to hold Black and Zamasu off while Goku, Vegeta, and Bulma retreat back into the present after they give Future Mai the senzu beans. Goku is taken for medical treatment while Vegeta explains what happened in Future Trunks' timeline and Black's origin to Beerus and Whis with the former taking his leave as he only remained to learn Black's connection to Zamasu. Meanwhile, Chi-Chi and Gohan meet with Krillin to ask if he knows where Goku went while finding Goten with Trunks as he intends to travel to the future. After everyone assembles, they discuss how to defeat Black and Zamasu when Piccolo proposes using the Evil Containment Wave (魔封波, Mafūba) which was used on his previous incarnation. Goku decides to learn the technique from Master Roshi's while Vegeta trains in the Hyperbolic Time Chamber, Beerus approaching Gowasu to deal with his wayward apprentice.