When a babysitting client says, "You're my favorite babysitter ever", Sam and Cat debate which one of them he meant. They compete for their new clients' affection to see who really is the best babysitter.
Sam, Dice and Goomer go to an MMA fight and leave Cat home to study. Upon returning, they discover that Sam's motorcycle is missing and Cat can't remember the day. The group sets out to solve the mystery and get Sam's bike back.
Sam and Cat's babysitting skills are tested when they look after a young boy, Oscar, who is very prone to accidents. The girls are determined to showing Oscar a fun time while struggling to keep him out of harm's way.
Cat's old friend Jade West unexpectedly comes over to study with Cat, but Cat - who is terrified of the thought of her and Sam together - commands her to wait outside. Predictably, Jade does the opposite of what she's told, and it turns out she and Sam hit it off immediately. Cat gets jealous, and in an attempt to get back at Sam decides to call Sam's old friend from Seattle, Freddie Benson, and gets him to L.A. When Cat obviously flirts with Sam's ex boyfriend, Sam is of course not about to give up so fast, so she gets in touch with Cat's friend/crush from Hollywood ...
Sam & Cat must find a way to enjoy their favorite drink after it's been banned from California. But once they manage to have as much of it as possible and share it with everyone else, they find the authorities are searching for the seller.