In alphabetical order: Gayle Hunnicutt (Vanessa Beaumont) appears in three episodes, as does Barbara Stock (Liz Adams).

Michael Wilding (Alex Barton) appears in a major story-arc, although he doesn't return for the final season.

Claude Earl Jones appears in two episodes as Duke Carlisle, a character who will return for the final season, recast with Clifton James in an "also starring" capacity.

The thirteenth season of Dallas was released by Warner Bros. Home Video, on a Region 1 DVD box set of three double-sided DVDs, on April 13, 2010.

[1] James urges Cally to hire a divorce lawyer who then advises Cally to locate J.R. so that she can serve him with divorce papers before he serves her; Cliff tries to convince Liz to move to Dallas and when he introduces her to Carter it's clear that they have a history; in the sanitarium, J.R. has a lot of roadblocks to deal with in trying to see Jessica.