<Li> 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 . </Li> <Li> 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 . </Li> <Li> 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 . </Li> <Li> 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 . </Li>

Who plays the head of the other side on kc undercover