The Final Chapter", it is revealed that he is a villain called The Mask and is jealous of Beverly for being the head of the Organization. Sherri Shepherd as Beverly, the head of the Organization. She is good friends with the Cooper family. James DiGiacomo as Petey, a "friend" of Judy's. Judy finds him annoying, as he has proven to be skeptical of the Cooper household, when Judy is alone. He's shown to be obnoxious and loud every time he screams out Judy's name. Jaime Moyer as Mrs. Goldfeder, the Coopers' neighbor and Petey's mother. Like Petey, she is also obnoxious and loud, frequently visiting the Cooper's house. Ross Butler as Brett Willis, an enemy spy and K.C.'s ex-boyfriend. In "Operation: Other Side, Part 2", it is shown that Brett was kicked out of the Organization, after he was discovered working as a double agent and being the son of Zane. He now works for the Other Side as a hand-to-hand combat instructor. In "K.C. and Brett: The Final Chapter – Part 1", Brett was sent to kill K.C., but failed, and he is now currently on the run from the Other Side in Canada. François Chau as Zane, a member of the Other Side and the father of Brett. After Richard is captured by the Coopers, he becomes the new leader of the Other Side until he is apprehended again. Lee Reherman as Victor, the underboss of the Other Side. Kara Royster as Abby, the long-lost cousin of K.C. and Ernie and the daughter of Erica Martin and Richard Martin. She is secretly a member of the Other Side who was sent to reactivate her mother's status. Jasmine Guy as Erica, the sister of Kira, the estranged wife of Richard Martin, the mother of Abby, the aunt of K.C. and Ernie, and a member of the Other Side who went inactive. Rick Fox as Richard, the father of Abby, the husband of Erica, and the uncle of K.C. and Ernie. He is the leader of the Other Side that has eluded the Organization. Connor Weil as Brady, an enemy agent who works for a renegade spy organization known as the Alternate. He appears in the third season where he manipulates Marisa into helping him following Zane's arrest. In the episode "Revenge of the Van People", it is revealed that he is a double agent now working for the Organization.