Faced with a daunting school recital, Russel has a recurring nightmare about performing the accordian in front a hoard of monsters. In Under, the Dream Gulper arrives and materializes the dreams of its sleepers. Bob catches the Dream Gulper for his dream of being giant and ruling all the local kingdoms to come true. Russel has to confront his fears to reach the Dream Gulper and stopping Bob's dream from becoming reality forever at sunset.