Fans of ABC's Once Upon a Time hoping to see Rumple (Robert Carlyle) and Belle (Emilie de Ravin) being happy and enjoying their time as a couple will probably be disappointed in Season 4.

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After a rocky road, Belle and Rumple were officially married in the Season 3 finale of the fantasy series. Their happiness will not be lasting very long at all, according to Carlyle.

Carlyle told E! Online in a new report that Belle and Rumple will be happy "maybe in the first episode, but then that's it."

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Meanwhile, de Ravin noted that Rumple is "bipolar" and that fans should not start thinking that he is actually a good guy.

Carlyle said that the Twitter trending topic for the Season 4 premiere will be "#Dance," though there is no indication yet as to what that means.

Belle, Rumple and the other Storybrooke characters may have to take a backseat to the Frozen invasion in Season 4, however. The introduction of characters from Disney's massive sensation Frozen will include Elsa (Georgina Haig), Anna (Elizabeth Lail), Kristoff (Scott Michael Foster), Hans (Tyler Jacob Moore) and Pabbie, the elder troll (voiced by John Rhys-Davies).

The Season 4 premiere is titled A Tale of Two Sisters, a rather clear indication that Frozen will be hitting the residents of Storybrooke right away.

Once Upon a Time Season 4 is set to premiere Sunday, Sept. 28 at 8 p.m. on ABC.

Tags: Once Upon A Time television ABC