Karen MacKenzie record for an actress on American primetime television. Karen's storylines focus on family troubles, addiction and kidnapping. In her early years on the serial, the character had much more of an "edge" in order to test the audience on who would be the most like J. R. Ewing (Larry Hagman), the primary character of its parent series "Dallas". (The bad girl role would later be taken on by Abby Cunningham, Karen's sister-in-law.) Over time, she became much more of a wholesome character. Series creator David Jacobs said "Karen is the tent pole. She says the things I want to say.
Ken Kercheval role as Cliff Barnes on the CBS television series "Dallas". He starred in the show from 1978 to 1991, from pilot episode to series finale. He initially was cast as Ray Krebbs before being given the role of Cliff Barnes. Kercheval and Larry Hagman were the only "Dallas" cast members to stay with the series throughout its entire run, although Kercheval's character was only a recurring character during the first two seasons. He became a regular cast member in the 1979-1980 season. Kercheval reprised the role of Cliff Barnes in the 1996 "Dallas" reunion, "J. R. Returns", and he appeared