Josh Henderson stars on Dallas as John Ross Ewing III. He's seen here on the episode "Family Business."
Added:
Will John Ross lose Elena when he has to chose between business and family on Dallas. "Family Business" is the ninth episode of the show's first season.
Added:

Dallas Season 1 Episode 9 Quotes

The plans to Christopher's rig or I put a bullet in your little fairy tale.

Tommy

I know you must be thinking how did I get so lucky to snag this guy, aren't you?

John Ross