The Art of Dallas: ‘Secrets’

Valene (Joan Van Ark) turns to Bobby (Patrick Duffy) for help in this 1979 publicity shot from “Secrets,” a third-season “Dallas” episode.

The Art of Dallas: ‘The Silent Killer’

Sue Ellen (Linda Gray) is seen in this 1979 publicity shot from “The Silent Killer,” a third-season “Dallas” episode.

The Art of Dallas: ‘Whatever Happened to Baby John? Part 1’

J.R. and Sue Ellen (Larry Hagman, Linda Gray) are seen in this 1979 publicity shot from “Whatever Happened to Baby John? Part 1,”“Dallas’s” third-season opener.

The Art of Dallas: ‘Black Market Baby’

Rita (Talia Balsam) and Sue Ellen (Linda Gray) shop in The Store’s maternity department in this 1978 publicity shot from “Black Market Baby,” a second-season “Dallas” episode.

The Art of Dallas: ‘Bypass’

Jock (Jim Davis) suffers a heart attack and receives help from J.R. (Larry Hagman) in this 1978 publicity shot from “Bypass,”a second-season “Dallas” episode.

The Art of Dallas: ‘Old Acquaintance’

Jenna and Bobby (Morgan Fairchild, Patrick Duffy) shop in this 1978 publicity shot from “Old Acquaintance,” a second-season “Dallas” episode.

The Art of Dallas: ‘Reunion, Part 2’

J.R. (Larry Hagman) pressures Gary (David Ackroyd) to learn the family business in this 1978 publicity shot from “Reunion, Part 2,” a second-season “Dallas” episode.

The Art of Dallas: ‘Reunion, Part 1’

Sue Ellen and J.R. (Linda Gray, Larry Hagman) are seen in this 1978 publicity shot from “Reunion, Part 1,” “Dallas’s” second-season opener.

The Art of Dallas: ‘Barbecue’

Jock and Miss Ellie (Jim Davis, Barbara Bel Geddes) are seen in this 1978 publicity shot from “Barbecue,” “Dallas’s” first-season finale.

The Art of Dallas: ‘Winds of Vengeance’

Sue Ellen (Linda Gray) is forced to remove her raincoat in this 1978 publicity shot from “Winds of Vengeance,” a first-season “Dallas” episode.