Superbook (2011)

Season 1: Episode 6

Chris Quantum loses the courage to play his guitar in front of a crowd. Superbook whisks the kids off to meet another boy who had to face his own "giant." Chris, Joy and Gizmo befriend young David who is taking bread to his brothers on the front line of battle fighting the Philistines. It's when David meets the giant Goliath that Chris finds the courage to face his own giants.