Gabby Duran lands an out-of-this-world job in her new town thanks to her Principal: babysitting an unruly group of important extraterrestrial children who are hiding out on Earth.

When Gabby hears a rumor about herself going around at school, she uses a telepathic alien to find out who started it, jeopardizing the alien in the process.

When Dina hires Susie Dustman, a self-proclaimed "super-sitter," to watch Olivia, Gabby's jealousy drives her to go toe-to-toe with the rival sitter for her sister's affection.

Gabby is determined to get her mom a gift that makes up for last year's disaster. Meanwhile, Swift prepares for the end of his assignment on Earth.

When Jeremy accidentally sneezes on Gabby, his mucous causes Gabby to become an academic genius; now armed with super smarts, Gabby battles arch rival Susie in a math showdown.