54

 54. 8-second 3D kids cartoon. Librarian thanks all four superheroes and their toddler helpers. Librarian says, “You returned every missing book.” Marcus says, “We couldn't have done it without the toddlers, They were great helpers.” The toddlers cheer.

Marcus is a light skinned 8 year old boy with short black hair wearing a red short sleeve shirt, with a star on his shirt, blue jeans and red shoes with a red hat. He's wearing a blue cape and a red watch on his wrist.