In the premiere episode, Jessie accepts a job as a nanny and moves in with the Ross family, high-flying couple Christina, a former supermodel turned business mogul, and Morgan, a famous movie director, their four kids Emma, Ravi, Luke and Zuri and their beloved 7-foot Asian Water Monitor Lizard. Nanny responsibilities are more difficult than Jessie anticipated as she coaches Emma, who is on the brink of a science fair meltdown.

After Jessie accepts an invitation for lunch with Tony, the building's doorman, Emma offers Jessie unsolicited dating advice she has learned from her stash of teen magazines. Meanwhile, Ravi becomes the target of Luke's practical jokes.