<Tr> <Th> First cousins </Th> <Td> <Ul> <Li> Lucy Ewing </Li> <Li> Christopher Ewing </Li> <Li> Bobby Ewing </Li> <Li> Betsy Ewing </Li> <Li> Molly Whitaker </Li> <Li> Lucas Krebbs </Li> <Li> Margaret Krebbs </Li> </Ul> </Td> </Tr> <Ul> <Li> Lucy Ewing </Li> <Li> Christopher Ewing </Li> <Li> Bobby Ewing </Li> <Li> Betsy Ewing </Li> <Li> Molly Whitaker </Li> <Li> Lucas Krebbs </Li> <Li> Margaret Krebbs </Li> </Ul> <P> John Ross Ewing III is a fictional character from American prime time soap opera, Dallas and the 2012 continuation series . The character was first written into the series in the episode named John Ewing III: Part 2 which first aired on April 6, 1979 . Omri Katz prominently played the role in the series from 1983 until its conclusion in 1991 and the subsequent follow - up movie Dallas: J.R. Returns . In the continuation series, actor Josh Henderson stepped into the role . John Ross is the son and namesake of show's most iconic character, J.R. Ewing, and his longtime love, Sue Ellen Ewing . </P> <P> The continuation series focuses on John Ross's feud with his cousin Christopher as they disagree over how to restore the Ewing name to its former glory . Tensions also arise between the cousins due to John Ross's romance with Christopher's ex-fiancée, Elena Ramos . At the same time, John Ross does his best to live up to his father's legend, using every dirty trick in the book to get what he wants . However, John Ross still has a few lessons to learn and J.R. returns to Southfork to teach him . John Ross uses his resentment toward Sue Ellen and her guilt to manipulate her, but his father is a different story . When John Ross's schemes culminate in the end of his relationship with Elena, he teams up with - and later winds up falling for and marrying Christopher's ex-wife, Pamela Rebecca Barnes, the daughter of J.R.'s nemesis, Cliff Barnes and their union is reminiscent of John Ross's uncle Bobby Ewing's marriage to Cliff's half - sister and Pamela's namesake Pamela Barnes Ewing . However, their relationship has the potential to be very dysfunctional, similar to the relationship between John Ross's parents . With the passing of Larry Hagman and his character J.R. in 2012 and 2013 respectively, Henderson's John Ross is pushed to the forefront as the main protagonist of the series . </P>

Who played john ross ewing in the original dallas