AJ, a little monster awake past their bedtime, has made a terrifying discovery: There's a human under their bed! But humans, it turns out, aren't actually all that scary. In fact, this one seems to have a lot in common with AJ. There's just one thing that sets them apart: AJ is in a hurry to grow up and enjoy all the freedoms of adulthood, while the human yearns to go back to the comforting embrace of his childhood.