21

 21. 8-second 3D kids cartoon. Marcus and toddlers Milo, Ava, and Benji discover a hidden door behind a bookshelf. Marcus says, “This wasn’t on the library map.” Benji says, “Open it!” Marcus uses his power to gently push the door open. Ava says, “Whoa!”

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.