Believe me, I didn't think he could at first either. But...he did it.

[Krillin folds his arms across his chest and shakes his head.]

Piccolo didn't believe it either, neither did Vegeta. But Goku asked him to fight Cell. And he won. I never thought I'd see it, but Gohan was able to transform into a Super Saiyan 2. And he won. He beat that guy and saved you and your sister. He saved us all.