During a prologue of "A Kid's Big Adventure", Riser pulls out a magic wand from his pocket and says to Ben that he stole the Guardian Angel's Magic Scepter from the Guardian Angels and uses it to attack Ben. While Ben was still unconscious, the Guardian Angels appeared and the two of them checked on Ben.
2nd Guardian Angel: Oh, thank heavens! He’s been gravely injured! But I’m sure he’ll recover.
9th Guardian Angel: But what’s the use? Riser is too powerful and he still has the magic scepter! It’s hopeless! Hope is lost!
1st Guardian Angel: Everyone, just calm down. As long as we keep together. Now, our fates are in Ben's hands. We must try to revive him. Gather around, everyone! Send Ben your power!
And with that, the Guardian Angels gave Ben their new power.
1st Guardian Angel: Phew… that’s it. That’s all we can do now. Ben, please get up, please.
When the Guardian Angels disappeared, the Lumas came upon an unconscious Ben and takes him to the Cosmic Observatory to get him recovered in the bedroom dorm.