In Waterfalls (2), while at Little Miss Steaks for the celebration of the "Bright Sparks" win at a competition, Lisa tells K.C. that Kevin is being released from jail early, and he wants to visit him.
In Rusty Cage (1), he is seen for the first time eating pizza with K.C. in the mall. Later at home, he wants K.C. to help him with resume to get a job. K.C. gets a text from Lisa to come home to tell him he got a job and they celebrate with wine which gets K.C. upset, despite the fact Lisa isn't supposed to drink or do drugs.
In Rusty Cage (2), he is mentioned by Lisa that she wants him to stay away from them. He is then outside of their apartment, drunk, banging on the door to let him in which makes K.C call the police.
In Heart Like Mine (1), K.C. mentions that Kevin used to say, "Smiling just lets the world know you're scared."
In Don't Let Me Get Me (2), K.C. gives Jenna a book of baby names from his mother and tells her not to name the baby Kevin, after his father.
In Tears Dry On Their Own (2), Jenna and K.C. are arguing over Jenna's pregnancy when K.C. tells her he can't be a dad, and reminds her that his own dad is in jail.