Bo hides her continued relationship with Ryan from Kenzi, who thinks Bo broke it off with him.
Lauren and Nadia return. Bo walks in on them being passionate, which creates an awkward situation.
Dyson shows up to bring Bo into an investigation about students who collapse and become unconscious at high school.
Bo goes undercover as a teacher, Kenzi as a student, and Dyson as a guidance counselor. None of them are particularly suited for their roles.
A cheerleader becomes infected and then Kenzi as well. Prior to the unconscious state, Kenzi gets very smart and is able to correct Lauren's formula about what is causing the infections. Lauren is able to develop an antidote and fixes Kenzi.
Ryan decorates the school gym for a dance and convinces Bo to not dump him.
Nadia took pictures of Lauren and looks at enlarged photos of Lauren's necklace.