[THIS ARTICLE IS DARK AND FULL OF SPOILERS]

Theories and rumors about 'Game of Thrones' are once again making their rounds online, especially now that the cast and crew have been assembled for filming. So it's no surprise that a rumor that once surfaced near the end of the fifth season has been resurrected by fans of the HBO series.

In late May, 'Game of Thrones' fans started speculating that Catelyn Stark will be making an appearance as Lady Stoneheart by the end of Season Five. The rumors were immediately squashed by show director Alex Graves, who stated that it would be a waste of talent to have actress Michelle Fairley play a zombie and just kill a bunch of people.

It looks like that could finally happen in Season Six. Irish Thrones, a fansite that has been following the show's shooting in Ireland, has just tweeted an unexpected spoiler alert.

Winteriscoming.com is quick to point out that this is only a rumor and that nothing has been confirmed so far. However, there could be a possibility that the series producers have casted a different actress to portray Lady Stoneheart, who will be deformed beyond recognition and could barely speak due to her slit throat. The army part may be a bit trickier, since the resurrected Catelyn Stark only leads a band of outlaws known as the Brothers Without Banners in the books.

Irish Thrones has also tweeted yet another spoiler, but one that has been acknowledged several times before.

The tweet may have simply misspelled the name "Lyanna," who is the sister of Ned Stark. The R+L=J Theory may finally be acknowledged in the show after an entire season of teasing at the two characters who might be Jon Snow's real parents. This would also mean that the fallen Lord Commander has a bigger role to play in the future of 'Game of Thrones.'

But wait, Jon Snow IS dead, isn't he? Find out what happens to Jon Snow when 'Game of Thrones' Season Six premieres on HBO next year.