When Gabby Duran moves to quiet Havensburg with her successful mom and overachieving little sister, she's recruited by her school principal for a special babysitting gig. The fearless and unapologetically bold new girl in town soon discovers her young charges aren't your standard unruly kids. They are very important extra-terrestrial children hiding on Earth with their families, and it's her job to protect them and their secret identities, and prove she's the best babysitter in the galaxy!