'Game of Thrones': Who might betray their queen or king?

— -- With only three weeks left to go this season, things are really heating up on "Game of Thrones."

Last week's thrilling episode saw Daenerys absolutely devastate the Lannister forces in her quest for the Iron Throne. But with the seven kingdoms on the line, loyalty may be hard to find.

Whether it's a bloodthirsty queen seeking allies and betraying others or a new leader who will stop at nothing to win, it can be hard to follow through on one's promise of support, especially with factors of the heart involved.

Here's a look at which characters are most likely to turn their back on their king or queen.

Tyrion Lannister

Tyrion and Jaime have always been close, and when he saw Jaime about to charge at Daenerys last week, Tyrion, her hand, muttered, "Flee, you idiot."

Jaime's future was left unclear at the end of that episode. (He was last seen sinking deep into the Blackwater Rush.) Tyrion still cares for his brother, and if Daenerys ends up capturing Jaime on Sunday and threatens to take his life, that could cause Tyrion to hesitate following her.

Plus, Jaime let Tyrion go when he was facing certain death, so would he repay the favor?

Furthermore, Tyrion could try his hardest to convince Jaime that Cersei, his sister and lover, doesn't have his best interests at heart.

Jaime Lannister

Which leads us to Jaime. Say Daenerys captures Jaime and offers to trade him to Cersei in exchange for something she values. What if Cersei denies the request?

That could be lead Jaime to turn his back on his love and side with his brother.

Cersei already said she would reward Euron Greyjoy if he delivers revenge for her, which he did. That didn't go over so well with Jaime, and furthermore, he now knows Tyrion did not kill his son King Joffrey.

What if Cersei, given the chance to spare Tyrion's life with this new information, says, "I don't care — I want him dead anyway"? That might make Jaime think twice about who he spends his time with.

Euron Greyjoy

This guy is completely unpredictable. He is violent and bloodthirsty and could turn on Cersei if she keeps rebuffing his advances. What if the handsome reward she promised is not what he wants? He could become a loose cannon.

Missandei

This may be a long shot, but hear us out. Missandei is Daenerys' right-hand woman, but she's also in love with Grey Worm, who is stuck at Casterly Rock.

What if Daenerys makes no attempts to save him, especially fresh off her victory with her dragon? What if she no longer believes she needs the Unsullied and can win this war without those forces, including Grey Worm? That might cause Missandei to equivocate.

Sansa Stark

At the end of season 6, we saw Petyr attempting to get inside Sansa’s head to sway her against her brother Jon Snow, the king in the North.

Littlefinger has implied that Sansa is the rightful heir in the North and not “Ned Stark’s bastard.” Could Petyr’s comments finally have an effect on her? Could a power-hungry Sansa stop supporting Jon and try to take over as leader with Littlefinger’s army behind her?

It has been suggested that Jon is the son of Rhaegar Targaryen, not Ned Stark. If this information comes out, that could affect the dynamic between Jon and Sansa. They could be cousins and not brother and sister, as everyone thinks. Littlefinger may use this information to persuade Sansa to overthrow Jon as king in the North.

After all, Sansa has been holding down the fort in Winterfell since Jon left for Dragonstone.