Adapted from the 2016 Marvel comic book series of the same name, Moon Girl and Devil Dinosaur follows the adventures of 13-year-old Lunella Lafayette - one of the smartest people in the world, although not everyone believes her - and Devil, her pet dinosaur, who arrived in the present day thanks to an accidental time vortex. The concept is an updated take on Captain America and X-Men co-creator Jack Kirby's 1978 Devil Dinosaur comic book series.