Goku's first fight against Frieza may have introduced the Super Saiyan form, but it isn't the battle that made SSJ the centerpiece ... and Future Trunks was only ever going to be present for ...

All this to say, Dende is going to stay in danger until Goku can master his abilities and ... to his limits again before being able to trigger SSJ again. Couple all this with the mention of ...

Dragon Ball Sparking Zero has already confirmed some of its new content, and a new trailer highlights more that's coming!