The "Game of Thrones" Season 4 premiere airs on Sunday, and the long wait for fans is finally over. The fourth season of "GoT" will be full of surprises and some truly epic events. Tyrion, Jaime, Brienne, Sam and Bran are going to be some of the most interesting characters to watch during the season, and here are a few moments to expect from these characters. You can read a spoiler-filled look at Arya, Jon Snow, Daenerys and Sansa here.

Warning: Full “Game of Thrones” season 4 spoilers. If you have not read the books, or want to remain surprised, stop reading.

1. Tyrion in trouble.

Tyrion Lannister is not going to have a good season. The quick-witted and sharp Tyrion will not be able to bluff or talk his way out of being accused of killing Joffrey during the Purple Wedding. His sister Cersei is quick to accuse him of the murder, and Tyrion is facing a certain death at trial. Luckily, Oberyn Martell, the Red Viper, offers him a way out; a trial by battle. The Red Viper will battle Ser Gregor Clegane, the Mountain in the eighth episode, "The Mountain and the Viper." Ultimately, Oberyn fails in battle, but does kill the Mountain, and Tyrion is once again saved from death by his brother Jaime. At this point, Tyrion's fate is forever changed and it will be interesting to see how fans react to his killing of Shae and Tywin. A more complex character, Tyrion is going to have an interesting, and darker, road ahead of him in "Game of Thrones."

2. Jaime Loses A Hand, Gains A Heart

Since the beginning of "GoT," Jaime has cared only about himself and Cersei. While not actively a villain, Jaime has been far from a sympathetic character, but that started to change when his lost his right hand, his sword hand that also represented his identity as a great knight and swordsman. In "GoT" Season 4, Jaime's transformation into a likeable character is completed after helping his brother escape his cell but also doing the "right thing" and telling his brother the truth about Tysha, Tyrion's first love. The revelation, that Tysha truly loved Tyrion, dooms his father but is a noble gesture from the "Kingslayer." Season 3 also marks the beginning of the end of the relationship between Jaime and Cersei.

3. Brienne Gets Back On The Road

Brienne of Tarth was originally tasked with returning Jaime to King's Landing in exchange for Arya and Sansa. That plan was pretty much doomed from the start, but Jaime wants to keep his promise to Catelyn Stark. At the start of Season 4, Brienne is in King's Landing with no plans. She swore loyalty originally to Renly and later to Catelyn, but both are dead and Jaime is in King's Landing. Ser Loras Tyrell still has some doubts about Brienne's involvement in Renly's death, but that is quickly cleared up and it's up to Jaime to give her a new mission. Jaime gives Brienne the Valyrian steel sword, Oathkeeper, that was given to him by Tywin in "Two Swords" and tasks her with finding Sansa, fulfilling his promise to Catelyn.

4. Sam Returns To The Wall 

Samwell Tarly has become a bit of an unlikely action hero, killing a White Walker while fleeing with Gilly and her son, but will miss the Battle at Castle Black. Chances are, Sam would not have been of much use in the fight, but he will be incredibly important to the future of the Night's Watch. With Lord Commander Mormont killed by his brothers, the Watch needs a new Commander. Through some clever scheming, Sam works to successfully get Jon Snow elected as the new Commander.

5. Bran Does Not Follow The Script 

"Game of Thrones" Season 4 is based on, roughly, the second half of "A Storm of Swords." In the "GoT" Season 3 final, "Mhysa," Bran met with Sam and Gilly and now has a way beyond the Wall. For Bran, that should be the end of his story, but Season 4 will feature Bran, and it is likely that events from "A Dance with Dragons" will be added. It is unclear how much the creators will use, but Bran could meet Coldhands during this season, testing his abilities and maybe getting to the cave of the three-eyed crow while adding some events not found in the books to give Bran more to do in the fourth season.

"Game of Thrones" Season 4 premieres on Sunday at 9 p.m. EDT on HBO.