List of K.C. Undercover episodes

Guest stars: Trevor Jackson as Lincoln, Tony Cavalero as Wally, Ashley Fink as Reena, Ashlee Fuss as Juli

K.C. tries to tell her parents that Ernie is ready to be a spy, even though he is clumsy. They then introduce them to Judy, who is a robot disguised to be a 10 year old, and tell Ernie that K.C and their parents are spies. K.C. takes Ernie on a mission and does not tell Craig or Kira to prove to them that Ernie is ready to be a spy. He crashes a van into the museum because he was parked in a loading zone and the police told him to move it, but he did not know how to drive. At the end, he becomes a spy after he reroutes the GPS of the person K.C. could not stop on the mission to their home.

Guest stars: Charlie Robinson as Pops, Roz Ryan as Grandma, Diane Delano as Honey, Tony Cavalero as Wally

Marisa becomes a finalist for a contest to get a photo featured in magazines and billboards, but her photo is of K.C. While trying to stop Marisa from using the picture, K.C. is suddenly caught in an argument with Marisa, who takes a stand and says they shouldn't be friends anymore. In the end, Marisa finally finds out that K.C. is a spy. Meanwhile, Craig and Ernie make Judy do all of the chores Kira gave them.

Guest star: Shainu Bala as Mikal

Guest stars: Tom Williamson as Prince Promomomo, Erron Jay as Olu

Marisa turns in a paper report based on one of K.C.'s recent missions, not realizing that it could blow K.C.'s cover as a spy. K.C. and Marisa then try to get the paper back from her teacher, Mr. Forman. K.C., disguised as a substitute teacher, goes into the teacher lounge, but is unsuccessful in retrieving the paper. Agent Beverly keeps calling K.C. to ask for the report and later disables her spy equipment until K.C. gives her the report. Meanwhile, Judy's robotic friend Trudy visits, but they get into a fight over who is a better robot.

Guest stars: Sherri Shepherd as Beverly, James DiGiacomo as Petey, David Shatraw as Mr. Forman, Madison Horcher as Trudy, Jaime Moyer as Mrs. Goldfeder

K.C. gets mad when her English teacher gives her a B and she thinks he is a 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.

Special guest star: Bella Thorne as Jolie

Guest star: Kurt Scholler as Mr. Enright

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. starts hanging out with Brett more often, but Kira is suspicious of him. Craig thinks she is being paranoid. Brett convinces K.C. to go with him to a Beyoncé concert out of state, but he tricks K.C. and actually takes her to Zane's barn, where she is then tied up. Zane has created a look-alike K.C. through laser cosmetic surgery. He sends the look-alike to the Cooper household to pose as the real K.C. Meanwhile, Judy becomes obsessed with a character in Ernie's video game.

K.C. is captured by Zane and nobody knows because he created a K.C. look-alike whose name is Bernice, but Marisa is starting to realize K.C. is not the real K.C when she agrees to go to a party with Marissa. Then the K.C. look-alike locks Marisa in the barn with K.C. after Marisa realizes that the K.C. look-alike does not know that Marisa knows that K.C is a spy. However, Marisa has K.C.'s lipstick and K.C. breaks their handcuffs. K.C. then goes to the Organization to stop the K.C. look-alike and Brett. After a fight with Brett, K.C knocks him out and tells him that shes' breaking up with him. Meanwhile, Craig and Kira finally realize the K.C. look-alike is fake and go to the Organization, but have make a decision on who is the real K.C. when the K.C. look-alike arrives. Zane holds Ernie and Judy hostage at the Cooper house, but Craig defeats him while Kira distracts him.

When K.C. is planning to go to Miami with Marisa for a vacation, Craig tells K.C. she must go on a stakeout to catch a notorious robber. During a phone call, she learned her dad lied so she could stay and she was never assigned to the case. K.C ends up not talking to Craig. Meanwhile, Ernie is mad at his dad and K.C. because they both think he's just a computer geek. He goes to El Froyo Loco and sees the notorious robber and calls K.C. for help, but K.C. wants him to take the robber out to give him a chance to "bake the biscuits" and prove to his dad that he is more than just the computer guy. After the mission K.C. makes it to the beach. In a side story, Craig keeps getting mad at the takeout restaurant guy who tries to overcharge him for food he didn't want or order

Guest stars: Sherri Shepherd as Beverly, Paras Patel as Delivery Guy, Daniel David Stewart as Stanley

Mrs. Goldfeder's house has been robbed, so K.C. volunteers her dad to be the neighborhood watchdogs leader. However, he doesn't think it's a good idea. K.C. then tries to sneak around and be the leader, but Craig finds out and yells at K.C. The burglar goes to Mrs. Goldfeder's house and K.C. finds out it's her dad. K.C. and Craig mistake a person who's taking out the garbage for a burglar. Craig lets his teammate, Herb, use the bathroom in the Cooper house only to discover he's the one who's stealing everything. K.C. and Craig apologize to each other. Meanwhile, Judy is trying to get away from her friend at school who likes her and brings in her other friend Petey to pretend they're dating, though Petey really thinks she likes him. Both of them go to El Froyo Loco and Pentatonix tries to help Judy tell Petey that she doesn't like him by performing a rendition of Ariana Grande's "Problem" through the credits, but he still doesn't believe her.

Guest stars: Pentatonix, James DiGiacomo as Petey, Jaime Moyer as Mrs. Goldfeder, Fred Stoller as Herb, Dat Pham as Slippy

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.

Guest stars: Cocoa Brown as Big Ange, Vivian Marie Lamolli as Scar, James DiGiacomo as Petey

K.C. enters the Other Side. She calls Craig and learns that her mission is to destroy a dangerous missile and recover a biological agent from the Other Side. When she has to take a hand-to-hand combat class it is revealed that Brett is her instructor. Brett helps her get to the missile and she deactivates the missile. However, the Other Side finds her and a fight ensues. When Victor, the leader of the Other Side, tries to destroy K.C., Brett comes in and saves her and helps her escape. Judy wants Craig to buy her a dog. Craig says no because he's more of a cat person. They reach a compromise when Craig buys Judy a robot dog named Snuggles.

Guest stars: Ross Butler as Brett Willis, Lee Reherman as Victor

Guest stars: Jonathan Schmock as Lloyd, Natalija Nogulich as Mrs. Vandervoort, Erin Matthews as Mrs. Andrews, Noah Crawford as Gabriel

Guest stars: Telma Hopkins as Miss Holley, Reign Edwards as Kitten

Judy gets upset when she finds out she does not have a birthday. K.C. locates Judy's creator, Simone, so they can meet each other. K.C. and Judy get into a huge argument. Judy runs away to live with her creator, but since Judy is understanding feelings she gets sad when nobody pays attention to her. Judy runs away again and gets tricked into working for The Other Side. She tries to run away from The Other Side. K.C. and Simone team up and work together to bring Judy home. Meanwhile, Ernie and Marisa find out that they were flirting with each other when they were playing a video game.

Special guest star: Raven-Symoné as Simone

Guest stars: Chris Ellis as Christos, James DiGiacomo as Petey, Mike Lane as Paul

Ernie and Judy's mission to intercept an evil wolf serum at the Central Park Spooktacular goes a little off-track when they meet Emma Ross and Zuri Ross from Jessie. Back home, K.C. and Marisa throw a Halloween shindig of their own, with K.C. deciding to dress up as a spy in hopes of impressing River, the new boy in school but loses her expensive heart bracelet for communication with the Organization.

Special guest stars: Peyton List as Emma, Skai Jackson as Zuri

Kira is arrested by The Organization, with only 72 hours for K.C. and lawyer Maggie Summer to prove her innocence before she's handed over to the Chinese Government for destroying a building in Hong Kong. K.C. later finds out that her lawyer is a fraud, turning out to be an ex-cohort of Kira. Meanwhile, Judy is accidentally mailed out of Washington, D.C.

Guest stars: Arden Myrin as Maggie, Patrick Cassidy as Chuck Maddox, Rick Hall as Agent Johnson, Michelle Noh as Real Maggie

K.C. invites Craig's father, Earl, over for the holidays, but it is discovered that they have been feuding with each other for quite a while because Earl is disappointed in Craig for not going to medical school and continuously brings up how he quit and gave up on that dream. Marisa later stops by and gives the Cooper family a gingerbread house, saying that her family really loves them; however, Ernie finds a card and finds out the Marisa lied. Eventually, Craig has enough and kicks Earl out of the house, but Ernie hacks the airport's computers so Earl can not leave, forcing him and Craig to attempt to make up. Meanwhile, Ernie and Kira go off on a mission, but Kira ends up being captured. After Ernie calls for help and K.C., Craig, and Earl arrive, Craig orders Earl to remain in the car, but he later gets out and discovers that the Cooper family are spies. Craig and Earl later make up, but that doesn't last long after Kira sprays Earl with the memory spray.

K.C survives the car incident and both K.C and Brett think they are safe from Ursula for now but they soon find out that Ursula too survived the car accident. Because The Organization has made it clear that Brett can not come back, the Cooper family is under constant threat of the Organization finding out that they are hiding Brett. K.C and Ernie both take Brett to a Marissa's Cabin that borders Canada so that Brett will be safe but then Ursula finds them and attacks them. While Ernie and Marissa safely evacuate, K.C and Brett try to take down Ursula. They ride away on horses and Ursula finds them and kills Brett. K.C injures Ursula and she rides away saying that she'll be back for her. When K.C goes to Brett to see if he is dead, Brett reveals that he was wearing a laser proof t-shirt. To be safe, Brett must ride to Canada and risk never seeing K.C again. In light of recent events, the Coopers are removed from the Organization and Judy is reassigned to another spy family.

Guest stars: Chris Tavarez as Darien, Kara Royster as Abby, Rick Hall as Agent Johnson

Special guest star: Jasmine Guy as Erica

Guest stars: Kara Royster as Abby, Rick Hall as Agent Johnson, Tyler Poelle as Agent Gibb

Special guest star: Jasmine Guy as Erica

Erica and Abby force K.C.and Mrs. Cooper to sneak them past hotel security. Abby reveals the truth about her father. And K.C. now knows who the head of the other side is, yet she has no idea of a name or a face. In the end men from the organization have him cornered but Abby's father says it isn't him, the organization believes him and he escapes with Erica and Abby.

Special guest star: Jasmine Guy as Erica

Guest stars: Rick Fox as Richard, Kara Royster as Abby, Rick Hall as Agent Johnson, Robert Gant as Jackson, Ethan Wacker as Collin

Guest stars: James DiGiacomo as Petey, Jaime Moyer as Mrs. Goldfeder, Mike McCafferty as Todd Clint

Guest stars: Kevin Csolak as Adam, Nikki Castillo as Akina

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.

Guest stars: Florence Henderson as Irma, James DiGiacomo as Petey

When an agent from the Other Side is arrested, Craig and Kira discover that he is the man who married them which K.C. then points out that Craig and Kira were never legally married. K.C proceeds to attempt to make them a do-over weeding. Meanwhile, she gives advice to Marissa and Ernie which messes up both of their relationships. Craig and Kira get into an argument which ends with them making up and getting re-married

New canine spy Dexter, joins K.C. on her next mission as she tries to stop a ring of firework smugglers. When K.C. and Dexter take a disliking to each other, K.C. is taken off the mission with Ernie taking her spot. Ernie is kidnapped by the smugglers until K.C. and Dexter come to save the day. But when K.C. is fired with a shot, Dexter takes the shot. Dexter survives. Meanwhile, Marisa gives Judy some of her old dolls but is disappointed when Judy throws them in the trash. That causes Marisa and Judy to play with the dolls together.

Guest stars: Roz Ryan as Grandma Gayle, Tom Wilson as Agent Whitman

Guest stars: Rick Hall as Agent Johnson, Alice Lee as Keller, Rafael Petardi as Rollin

Guest stars: Ross Butler as Brett Willis, Jaime Moyer as Mrs. Goldfeder, David Hull as Damon, Natalie Lander as Darci

Guest star: Noah Weisberg as C.W. Barnes

Guest stars: Rick Hall as Agent Johnson, Francois Chau as Zane

Guest star: Joel Brooks as Dr. Levinstein