K.C. Cooper, a high school math whiz and martial arts expert, learns her parents are spies when they recruit her to join them in the secret government agency. The newly appointed teen spy takes on her first undercover assignment, which coincides with her school dance. The mission: apprehend an enemy teen spy and recover the code for a virus designed to render every mobile device useless.

K.C. and Ernie team up with their retired-spy grandparents - Grandma and Pops - to rescue Craig and Kira from a dangerous mission.