The cast of the revamped sex-and-scandal drama was plunged into mourning in November (12) when Hagman, who played the programme's lynchpin J.R. Ewing, passed away following a battle with cancer.
Dallas writers decided to honour Hagman's legendary scheming oil baron character by bringing back several of his former mistresses, including Mandy Winger and Afton Cooper, played by Deborah Shelton and Audrey Landers respectively, as well as Cathy Podewell, who played Ewing's second wife, Cally.
Gray - Ewing's first wife Sue Ellen in the show - was delighted to reunite with her former onscreen rivals as she has not seen the actresses since they were written out of the original Dallas run in the 1980s.
She tells UltimateDallas.com, "To me it was a joy to have former actors that had played pivotal roles in the original come back. It was great fun to have Deborah Shelton there - I had not seen her in 20 years or something. It was so much fun... Yeah Cathy and Deborah. It was so much fun.
"We giggled and laughed and exchanged phone numbers. I hope to see them when we get back. I did have a scene with Cathy and Deborah which was great fun."