After 13-year-old super-genius Lunella accidentally brings ten-ton T-Rex, Devil Dinosaur into present-day New York City via a time vortex, the duo works together to protect the city's Lower East Side from danger.
In season 2, Moon Girl and Devil Dinosaur are in their element as Super Heroes; however, as Moon Girl's Super Hero-ing intertwines more with her personal life, she must decide if the cost of keeping her identity a secret is worth the toll it takes on her family.