Abby is taking a giant leap onto the lunar surface. On a field trip to the moon, Abby is excited to try low-gravity bouncing and lunar rover rides. Unfortunately, her friend Gracie's older sister Claire is seriously spoiling the mood with her constant criticism of Abby. When Abby accidentally gets her friends trapped in an abandoned lab, she starts to wonder if Claire is right after all. Can Abby prove her wrong, escape the lab, and do something extra interstellar on the moon?