Filming for the third season of Dallas is underway and show star Josh Henderson (who plays John Ross), revealed that his character's promiscuous ways and the passing of JR Ewing causes his mother, Sue Ellen's, drinking problems to come back with a vengeance.

Henderson told TV Fanatic in an interview published Friday that Ross' relationship with Sue Ellen and her alcoholic issues will be a major storyline for the show this upcoming season.

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"Obviously when JR passed she had a few drinks and she was drunk at the funeral, and that's something that's a deep concern and a pain in John Ross since he was a kid. He hates seeing his mother drinking." He confessed that John Ross is aware that he isn't helping the situation. "He knows it's not good, it's not a good situation, but things he does and his actions this year, you know, it definitely is going to have his mother on the fence of how [she deals] with what she knows John Ross is doing."

He revealed that Sue Ellen is going to through many dark moments this season as she continues her struggle.

One thing that John Ross is doing this season that is huge is trying to find out who killed Ewing. He takes drastic measures including continuing his affair with Emma, despite being married to Pamela, in hopes of getting more information.

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"John Ross [is] obsessed with who killed his father..So he marries Pamela, he realized that he can get some info out of Emma...He truly does love Pamela. He doesn't want to hurt her. He knows that he's walking a dangerous line."

While trying to avenge his father's death by having the affair, Ross struggles with becoming just like his father, as much as he tries to deny it, others notice it as well.

"[The affair] becomes a sticky situation because [Emma] kind of falls for John Ross and John Ross is married. That never really stopped JR so, you know, history is kind of repeating itself a little bit...He is kind of obsessed with this back and forth of 'I'm not my father', but he kind of really is, and he's very much seeing a lot of JR in him and so is everybody else."

The third season of Dallas premieres on Monday Feb. 24 on TNT.

Tags: Dallas Season 3