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. tries to convince her parents that her brother, Ernie, who is a genius with computers but pretty clumsy at everything else, is ready to become a spy. However, Craig and Kira have a different plan and introduce them to their new little sister, Judy - a sophisticated humanoid robot disguised as a precocious 10-year-old.

K.C. reluctantly agrees to try out for cheerleading with Marisa so they can spend more time together. Meanwhile, Craig tries to bond with Ernie over sports, but quickly learns his son's gaming skills are better online than on the field.

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

Marisa has been named a finalist in a photo contest and her winning photo could be in magazines and billboards everywhere, the only problem is her entry photo is of K.C.

The Coopers are assigned to protect Prince Promomomo and must hide the teenage leader in their home for a few days. But when K.C. and the Prince become smitten with each other, Craig quickly puts his spy duties aside to remind the Prince that as K.C.'s father, he is the king.

When Agent Beverly from The Organization hassles K.C. for her last mission report, the same classified information that Marisa has inadvertently used as her class paper, the best friends must race against the clock to get the assignment back.

When K.C's somewhat awkward brother brings home a super gorgeous girlfriend, K.C is convinced that she's really a spy. She tries everything to get her to open up, including handcuffing her to an armchair and 'tickle-tasering' her. When nothing works, K.C pretends to talk to someone on her spy bracelet, saying that she'll get the 'important files' in her locker at school. Overhearing K.C's pretend conversation and thinking it was real, Jolie follows K.C to school where they end up having a fight. K.C manages to knock Jolie out with gas from her bracelet. Because Jolie was only Ernie's girlfriend for info about their family, K.C gets her to tell Ernie that she's going to be the first teen in space and must begin her training the next day. Jolie leaves forever and K.C then makes up with her brother and shows him her new earrings that she stole from Jolie.

When The Organization assigns Junior Spy of the Year, Brett Willis, to go undercover as K.C.'s boyfriend for a mission, K.C. winds up having real feelings for him. Meanwhile, Craig and Kira receive alarming news that their old arch rival Zane is back and determined to destroy them.

Zane has captured K.C., but her family has no idea because the evil agent has created a K.C. look alike to take her place and defeat the Cooper family.

The K.C. doppelgänger gains access to The Organization, now Kira and Craig must race against the clock to save their daughter and the agency.

When K.C. decides to take a must needed vacation during a stakeout to catch a notorious robber, Ernie finally gets a chance to "bake the biscuits" and prove to his dad and K.C., that he is more than just the computer guy.

When Mrs. Goldfeder's house is robbed, K.C. recruits her dad to organize and lead a neighborhood watch group, much to his chagrin. Meanwhile, Judy enlists Pentatonix to help her deliver a special message to Petey.

K.C. goes undercover as a college student at The University of Maryland to befriend and protect the President of The Organization's daughter, Eliza. Meanwhile, Judy tries to talk Ernie into letting her join his Adventure Scout troupe.

K.C. goes even deeper undercover into The Other Side’s training ground and is close to getting the intel she needs, when she discovers Brett is her new training officer.

K.C. goes even deeper undercover into The Other Side’s training ground and is close to getting the intel she needs, when she discovers Brett is her new training officer.

The Cooper family tries to take a much-needed vacation from spying, but their plans are interrupted when a wealthy socialite vanishes from their resort and K.C. is determined to find out what happened.

Kira tricks K.C. into participating in the mother daughter Cotillion Ball by telling her it’s an undercover mission. But K.C. puts a damper on her mom’s plans when she enlists Marisa to help her go from her usual tomboy drab to Debutant glam.

To rescue an agent's son at an all-boys cadet academy, K.C. goes undercover as a male cadet with Ernie.

K.C. Cooper enlists the help of former spy and computer engineering expert Simone Deveraux when her family's sophisticated robot, Judy, runs away and is captured by enemy agents.

Ernie and Judy must travel to NYC for the Central Park Spooktacular to intercept an evil wolf serum, but their mission is interrupted when they run into “Jessie’s” Emma and Zuri at the party. Meanwhile, Marisa and K.C. throw their own Halloween bash back at the house and K.C. decides to dress up as a spy to impress the new boy in school, River.

K.C. and Ernie who, when trapped inside a bank vault, must figure out how to put their sibling rivalry aside and work together to escape.

When a former foe needs the Coopers' help, the family has to decide if they can face the consequences of aiding the enemy.

K.C. plans to give her dad the most perfect christmas gift of all, a surprise visit from his dad. When he arrives, she’s the one who ends up surprised. It turns out that Craig and Poppa Earl not only don’t get along very well, he also has no idea that they are all spies.

Brett is back and his assignment is to eliminate K.C.! But when he can’t bring himself to complete his mission, K.C. decides to help protect him from The Other Side.

When K.C. enlists her family to help Brett escape from The Other Side, the Coopers find themselves in danger with enemy agents and The Organization.