During a prologue of "A Kid's Big Adventure", 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! 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, there’s 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.