During her first undercover assignment as a spy, K.C. Cooper gets ready for her first mission. Her parents, Kira and Craig Cooper, are also spies. However, her younger brother, Ernie Cooper, is unaware about K.C. and her parents being a spy, and her best friend Marisa is also unaware about her best friend's secret life. For her first assignment, K.C. is supposed to catch another teenage spy and crack down the code that is used for a dangerous virus. Unfortunately for her, K.C.'s first mission is also on the night of her high school dance, and she is challenged on whether to go through with her mission or go skip the mission and go to her school dance.
K.C. gets mad when her English teacher gives her a B and she thinks he is an undercover spy. It turns out that K.C. is just being paranoid. Meanwhile, Ernie finally has a girlfriend, whose name is Jolie, but when he brings her home, K.C. thinks she is an undercover spy as well. After attempting to prove it, and failing, K.C. eventually accidentally splashes some ketchup on Jolie's shirt which causes her to lose concentration and speak Russian. Realizing she was right all along, K.C. tricks Jolie into following her to school by pretending she has hidden spy documents in her locker and is going to retrieve them. K.C. finally gets Jolie to admit she's a Russian spy, there to obtain K.C.'s family weaknesses. After defeating her in a fight, K.C. gets Jolie to break up with Ernie. K.C also obtains a pair of earrings that are actually spy gadgets from Jolie.
K.C. has to go on an undercover mission with the Junior Spy of the Year Brett Willis. They must pretend to be a couple, though K.C. initially dislikes him. K.C. becomes jealous when Brett begins dating Marisa, who is aware that he is a spy. Later, Marisa ends their relationship. K.C. and Brett develop feelings for each other after they go undercover for a dancing competition. Craig and Kira's 20th anniversary is coming and Kira is upset that Craig does not want a big party to celebrate. Kira receives flowers from Zane, Craig's ex-partner, who became a double agent prior to K.C.'s birth due to jealousy that Kira did not like him. Craig allowed Zane to escape in exchange for his life. In a note to Kira, Zane informs the Coopers that he is planning revenge against them. Later, Brett tells the family that Zane is imprisoned and that he had sent the flowers and note from a computer at the prison. Brett then calls his father, Zane, to inform him that the Coopers believed his false story regarding Zane's imprisonment.
K.C. gets a mission at the University of Maryland to go undercover as a college student and protect the daughter of the president of the United States. K.C. ends up befriending Eliza, the president's daughter even though she can't. Marisa becomes jealous and ends up lying about her name when meeting Eliza. However, Eliza finds out who K.C is and refuses to speak to her. Marisa then uses her party-finding skills to find Eliza and tell K.C. K.C goes to the party and helps protect Eliza against kidnappers after she ditches her Secret Service men, repairing their relationship. Meanwhile, Ernie reveals that he is an adventure scout and Judy wants to join.
K.C. and Kira go undercover at a prison facility. K.C.'s disguise is a prisoner and Kira is a correctional officer. Their assignment is to find someone at the prison who is working undercover for a group of bad guys known as The Other Side. K.C. finds out it is Big Ange, a correctional officer, who offers K.C. an opportunity to join The Other Side. Kira tells K.C. that the Organization wants her to accept the offer and continue the undercover mission. K.C. continues her mission without Kira. Meanwhile, Petey keeps bothering Judy.
Following the events of the previous season, the Coopers are struggling to get used to their new normal life, while Judy becomes uncomfortable with her new family. By Marissa's suggestion, K. C. tries to participate in social school events, due to how she's seemingly unnoticeable by the public. She eventually decides to become DJ of the school, but ends up ruining one of the dances and is chased out by Darien and a few other boys who are part of the Boys' football team. Meanwhile, one of the Coopers' sworn enemies The Jackal escapes prison, and Judy is the first one to be alerted. She tries to convince her newfound parents to warn the Coopers, but they ended up rebooting her instead. Later on, they are captured by Agent Johnson, who gives them if chance to redeem themselves and get back into The Organization, if they could defeat The Jackal. They eventually agree only if they could get Judy back, though Craig was reluctant into being the one to lure The Jackal in. Judy shows up at the Coopers house, where they find that her memories have been erased, so Ernie is the who has to fix her. At that same moment, Craig train himself to take on The Jackal, but hurts his back, due to working out overtime. At school, K. C. agrees to tutor a failing student in her math class to get her mind off of her spy mission. However, she eventually backs down, when she finds out the student is none other than Darien. By then, she decides to face The Jackal by disguising herself as Craig. Her father begrudgingly agrees, stating other he and others spy agents will be on watch in the crowds of people, while Kira and Ernie will be in the van. They manage to locate him at a carnaval. During the fight on the ferris wheel, Ernie finally manages to restore Judy's memories by smacking her head, and just when The Jackal was earning the upper hand on K. C. by pulling on her leg, Judy saves her by grabbing her arm, giving K. C., a change to kick Jackal off, where he falls to his near-death. The next morning at school, K. C. informs Darien that he passed his math test all on his own and his given the chance to play football again. Pleased with his results, Darien thanks K. C. and he and his team start chanting her name. Back at home, K. C. gets a call from The Organization, informing the Coopers that they're resigned back in.
K.C. is undercover at a retirement home as a man. Her disguise name is Bernie. The target approaches the Senior Centre, speaking to his grandfather. K.C. then goes up to him and tries to hug him, using her own ways to manipulate him. K.C. then goes to meet this woman called Irma and they quickly become friends. They start to do these fun things together, including a coffee and a dance at the Olive Pit, reading magazines together, playing cards. Meanwhile, Judy tries to change Petey's mind when he says machines are stupid. She does things such as electrocute the fridge when Petey touches it and water being sprayed at him. Petey is spooked when he sees the toaster rise and a machine chasing after him. At night, Judy comes into his bedroom with alarms and machines ringing and moving. Judy gets Petey to repeat machines aren't stupid over and over. He then admits that machines aren't stupid. Also, K.C. and Marisa get into an argument when K.C. can't go to the dance to support the Food Bank because she is hanging out with Irma. Eventually, K.C. turns up to the dance.
K.C. and Ernie are assigned to go undercover and join a suspicious group of environmental activists known as the Volunteens so they can learn more about them and their leader, a young woman named Keller. K.C. and Ernie's cover is blown immediately as Keller knows they were sent to investigate her, which she allows them to do to prove that she has nothing to hide. Ernie becomes concerned that K.C. has been brainwashed into following the group's beliefs, after she begins agreeing with Keller. Meanwhile, Craig is assigned to protect Rollin, the ambassador to Monrovia, who is also an old friend. Craig prepares several large food dishes for Rollin, but is disappointed to learn that he no longer consumes fattening meals. Rollin convinces Craig to join him at a gym, but after Craig begins using a stair climber, Kira and Judy inform him that the machine has been implanted with a bomb that will detonate if he slows down. Judy eventually disarms the bomb, which was meant for Rollin. When Ernie tells his family about his concern for K.C., Craig tries unsuccessfully to convince him that she is simply maintaining her cover as one of Keller's followers.
When K.C. believes that she spotted Abby while driving in traffic, her family thinks that she is delusional and feeling guilty about killing her. However, Abby and her mother Erica are still alive and are planning to kidnap David Simmons, who created the security systems for the U.S. Treasury. They intend to gain knowledge from Simmons on how to break through the systems so they can steal money from the Treasury. When the Organization learns about The Other Side's plan to kidnap Simmons, the Coopers are sent on a mission to locate him and keep him safe. Simmons had retired to live a life of seclusion, but Ernie discovers that he owns a biker club in West Virginia. K.C. enters the club as a biker, while her family is undercover as lost tourists. While searching the club for Simmons, K.C. spots Abby, who is also looking for him. After a motorcycle chase, K.C. runs Abby off the road and apprehends her.
K.C. is assigned to go undercover as a construction worker at a tall unfinished building, allowing her to spy on a nearby tower where a group of renegade spies are believed to be meeting so they can discuss weapons. K.C.'s male co-workers at the construction site mock her for being a female. K.C. meets a female construction worker, Crystal, who tells K.C. that the men will eventually ignore her. K.C. later learns that the renegade spy group is working on sonic brain imploders, capable of melting people's brains. When Brady has Marisa gain knowledge about K.C.'s current mission, he warns his group that K.C. is spying on them and that she must be killed. A man is sent to the construction site to plant a brain imploder device. After a fight, K.C. takes down the man, but he says he does not know how to diffuse the imploder. Crystal has K.C. put the imploder into cement mix, which prevents it from detonating. Meanwhile, Judy gets in trouble at school after using mature logic to question a student's belief in the tooth fairy. Ernie is tasked with teaching Judy to behave like a normal child, to help maintain her cover as a spy robot. 59ce067264