"Dragon Ball Super" episode 49 is entitled "A Message from the Future! Goku Black Invades!" It also talked about the history of Future Trunks.
In Attack of the Fanboy's "Dragon Ball Super" episode 49 review, it was noted that this week's installment has revealed what Future Trunks has been up to since the Cell saga. Episode 48 opened with Black Goku and Future Trunks, who powered up to his Super Saiyan form, fighting. As they battled, the new villain revealed that he wants to put an end to the Saiyan race.
Future Trunks was able to escape Black Goku just in time. "Dragon Ball Super" episode 48 featured the arrival of Bulma's son to the present. Future Trunks also saw Goku and attacked him, thinking that he was Black Goku.
In "Dragon Ball Super" episode 49, Future Trunks realized that present Goku is the good Super Saiyan. Black Goku, on the other hand, still did not know where Future Trunks went.
Future Trunks then talked about how the new enemy in the future timeline looks like Goku. Future Bulma gave him the name "Black Goku."
However, it was revealed in "Dragon Ball Super" episode 49 that the villain refers to himself as just Goku. Could it be that the Super Saiyan actually turned evil in the future?
It was also noted that Black Goku just arrived about a year ago in Future Trunks' timeline. He has destroyed everyone and everything on Earth at such a short amount of time.
Future Bulma left a note in the time machine telling her old self about how to create more fuel. The note also included her plea to fix the machine so that Vegeta and Goku can go to the future and kill Black Goku.
According to Enstarz, the main focus of "Dragon Ball Super" episode 40 is that Black Goku has finally made it back to the past. The villain was able to conjure a Time Ring that enabled him to shift back to the past. His entrance in the timeline is deemed as one of the best villain entrances of the series.