S1·E35 A Wee Problem

Everyone is awestruck at the appearance of three moons above Neverland. Tinker Bell is especially thrilled, for this gives her the ability to shrink Peter down to fairy size and take him to visit the Fairy King. But she's not too happy when Peter insists that the Darlings and the Lost Boys come along. Tink messes with the others' ability to fly, which leads to such disaster that King Oberon kicks Wendy and the boys out. With the children unable to revert to their former size, they become easy prey for the pirates and the Crocodile, especially since Tink is keeping Peter distracted.