Ned Stark, Lord of Winterfell learns that his mentor, Jon Arryn, has died and that King Robert is on his way north to offer Ned Arryn’s position as the King’s Hand. Across the Narrow Sea in Pentos, Viserys Targaryen plans to wed his sister Daenerys to the nomadic Dothraki warrior leader, Khal Drogo to forge an alliance to take the throne.
Having agreed to become the King’s Hand, Ned leaves Winterfell with daughters Sansa and Arya, while Catelyn stays behind in Winterfell. Jon Snow heads north to join the brotherhood of the Night’s Watch. Tyrion decides to forego the trip south with his family, instead joining Jon in the entourage heading to the Wall. Viserys bides his time in hopes of winning back the throne, while Daenerys focuses her attention on learning how to please her new husband, Drogo.
Arriving at King’s Landing, Ned is shocked to learn of the Crown’s profligacy from his new advisors. At Castle Black, Jon Snow impresses Tyrion at the expense of greener recruits. Suspecting the Lannisters had a hand in Bran’s fall, Catelyn covertly follows her husband to King’s Landing, where she is intercepted by Petyr Baelish, a.k.a. “Littlefinger,” a shrewd longtime ally and brothel owner. Cersei and Jaime ponder the implications of Bran’s recovery; Arya studies swordsmanship. On the road to Vaes Dothrak, Daenerys finds herself at odds with Viserys.
Ned looks for clues to the death of his predecessor, and uncovers one of King Robert’s bastards. Robert and his guests witness a tournament honoring Ned. Jon takes measures to protect Sam from further abuse at Castle Black; a frustrated Viserys clashes with Daenerys in Vaes Dothrak; Sansa imagines her future as a queen, while Arya envisions a far different future. Catelyn rallies her husband’s allies to make a point, while Tyrion finds himself caught in the wrong place at the wrong time.
Incensed over news of Daenerys’ alliance with the Dothrakis, Robert orders a preemptive strike on the Targaryens that drives a wedge in his relationship with Ned. A captive Tyrion helps Catelyn, but receives a cold reception at the Eyrie from her sister, Jon Arryn’s widow Lysa. Sansa is charmed by the dashing Ser Loras Tyrell, a.k.a. the Knight of Flowers. Arya overhears a plot against her father.
Reinstated as the Hand, Ned sits for the King while Robert is on a hunt. Ned issues a decree that could have long-term consequences throughout the Seven Kingdoms. At the Eyrie, Tyrion confesses to his "crimes," and demands that Lysa give him a trial by combat. Joffrey apologizes to Sansa. Viserys receives his final payment for Daenerys from Drogo.
Explaining that the future of the Lannisters is at stake, Tywin presses Jaime to “be the man you were meant to be” as they prepare for battle. Ned confronts Cersei about the secrets that killed Jon Arryn. With the fate of the missing Benjen very much on his mind, Jon takes his Night’s Watch vows, though not with the assignment he coveted. After Ser Jorah saves Daenerys from treachery, an enraged Drogo vows to lead the Dothraki where they’ve never gone before. An injured Robert takes pains to ensure an orderly transition at King’s Landing.
In the aftermath of Ned's capture, Syrio and Arya face off against Lannister guards, while Cersei manipulates Sansa to her own ends. Robb rallies his father's northern allies against Tywin Lannister and heads south to war. Tyrion forms an uneasy alliance with the hill tribes and reunites with his father. Jon lashes out at Ser Alliser Thorne and battles a mysterious attacker from beyond the Wall. Dany is forced to reconcile her desire to conquer Westeros with Drogo's savagery after the Dothraki raid a peaceful village.
With Sansa's life in danger, Ned makes a fateful decision. Catelyn brokers an unsavory deal with the slippery Walder Frey. Tyrion acquires a mistress and is forced by his father to fight on the front lines. Robb wins his first major victory and captures a prized prisoner. Jon is rewarded for his valor and discovers a dark secret about Maester Aemon. As Drogo's wound festers, Dany defies her bloodrider Qotho and puts her trust in the enslaved witch Mirri Maz Duur.
As tragic news spreads across the Seven Kingdoms, Bran and Rickon share a prophetic dream, Catelyn interrogates Jamie about her son's fall, and Robb's destiny is forever changed. After a surprising decision by his father, Tyrion heads south. Arya assumes a new identity in an attempt to escape King's Landing, and Sansa is terrorized by Joffrey. At the Wall, Jon is forced to choose between the Night's Watch and the family he left behind. Across the sea, Dany pays a terrible price for her love, but finds new hope.
As Robb Stark and his northern army continue the war against the Lannisters, Tyrion arrives in King’s Landing to counsel Joffrey and temper the young king’s excesses. On the island of Dragonstone, Stannis Baratheon plots an invasion to claim his late brother’s throne, allying himself with the fiery Melisandre, a strange priestess of a stranger god. Across the sea, Daenerys, her three young dragons, and the khalasar trek through the Red Waste in search of allies, or water. In the North, Bran presides over a threadbare Winterfell, while beyond the Wall, Jon Snow and the Night’s Watch must shelter with a devious wildling.
In the wake of a bloody purge in the capital, Tyrion chastens Cersei for alienating the king’s subjects. On the road north, Arya shares a secret with Gendry, a Night’s Watch recruit. With supplies dwindling, one of Dany’s scouts returns with news of their position. After nine years as a Stark ward, Theon Greyjoy reunites with his father Balon, who wants to restore the ancient Kingdom of the Iron Islands. Davos enlists Salladhor Saan, a pirate, to join forces with Stannis and Melisandre for a naval invasion of King’s Landing.
Joffrey punishes Sansa for Robb’s victories, and Tyrion scrambles to temper the king’s cruelty. Catelyn entreats Stannis and Renly to unite against the Lannisters. Dany and her khalasar arrive at the prosperous city of Qarth. Tyrion coerces a relative into being his eyes and ears. Arya and Gendry are taken to Harrenhal, where their lives are in the hands of Ser Gregor Clegane. Stannis orders Davos to smuggle Melisandre into a secret cove.
The Baratheon rivalry ends, driving Catelyn to flee and Littlefinger to act. At King’s Landing, Tyrion’s source alerts him to Joffrey’s defense plan - and a mysterious secret weapon. Theon sails to the Stony Shore to prove he’s worthy to be called Ironborn. At Harrenhal, Arya receives a promise from Jaqen H’ghar, one of the prisoners she saved from the Gold Cloaks. The Night’s Watch arrive at the Fist of the First Men, an ancient ringfort where they hope to stem the wildings' advance.
Tyrion welcomes a surprise guest to King’s Landing for the royal wedding, but fears he’s come to the Red Keep for something else. Meanwhile, Jon warns his skeptical Night’s Watch superiors about an impending attack. Jaime struggles to regain his status at home. Arya encounters a face from her past, and Daario Naharis discusses strategy with Daenerys on the journey to the slave city Meereen.
A who’s who of honored guests turns out for Joffrey and Margaery’s wedding in King’s Landing, but the king’s taste in entertainment rubs many of them the wrong way. Meanwhile, Bronn gives a lesson to an unlikely pupil; Bran’s vision helps map out his journey; Stannis loses patience with Davos; and Ramsay takes a perverse delight in his new pet.
In the frenzied aftermath of the royal wedding, Tyrion gets a visit from a loyal subject, but wonders if anyone in his family will help him out of his current predicament. Meanwhile, Tywin offers to work for the common good with a presumed enemy. Sam takes stock of the personnel at Castle Black. The Hound gives another life lesson to Arya, and Daenerys makes a decision outside the walls of Meereen.