HBO has released scene stills from "Game of Thrones" season 4's upcoming episode, "First of His Name."

The images reveal a major spoiler for the upcoming episode, which involves Cersei and someone she would never be caught talking to before her son's death. You can check out the photos here.

Another interesting image release involves Sansa Stark. Actor Aidan Gillen explained to Entertainment Weekly what's in store for Sansa in his character Petyr Baelish's care.

"For me the season is about developing more of a parental and surrogate parental side - the sweeter side of Littlefinger comes through, as well," Gillen told EW. "I'm off on my travels and laying plans. He's always laying plans, [this is one of his] meticulous and far-reaching plans, geographically and generationally, even. So it's quite interesting. Am I being cryptic enough?"

Baelish has already admitted to orchestrating the murder of King Joffery to the oldest Stark girl. However, Sansa is unsure why Baelish would risk getting caught and losing everything the Lannisters have given him. Gillen admitted to EW Baelish is dangerous, but Sansa is safe for now.

"He's dangerous. People tend to refer to Varys and Littlefinger as the characters who are the most dangerous," he said. "Dangerous in that you're not sure what his game is or where his allegiances lie. You know, he's keeping a lot of options open and playing the long game."

"The obvious connection of Sansa being Eddard Stark's daughter," Gillen told EW. "There's also somebody there who holds some intrigue. I feel I can teach her, and take her under my wing. But I have a feeling she may have her own agenda."

"Game of Thrones" airs on HBO Sundays at 9 p.m. EST. Check out the teaser trailer for the "First of His Name" episode below.