K'Kath was a hologram of an adolescent Klingon who was friends with Jeffrey and Larg. K'Kath was added to The Doctor's holographic family program by B'Elanna Torres in an effort to make the picture-perfect family more realistic. He subsequently forbade his son to see either Larg or K'Kath and suggested that Jeffrey should find some nice Vulcan friends. However, the ban was lifted by Charlene, who questioned The Doctor's new family rules and schedules. K'Kath was played by Chad Haywood.