Written by George R.R. Martin in collaboration with Elio Garcia and Linda Antonsson

Viserys had also been the last Targaryen to ride Balerion…though after the death of the Black Dread in 94 AC he never mounted another dragon, whereas the boy Laenor had yet to take his first flight upon his young dragon, a splendid grey-and-white beast he named Seasmoke.

- Fire and Blood "Heirs of the Dragon: A Question of Succession"

Moreover, six other dragons made their lairs in the smoky caverns of the Dragonmont above the castle. There was Silverwing, Good Queen Alysanne’s mount of old; Seasmoke, the pale grey beast that had been the pride and passion of Ser Laenor Velaryon; hoary old Vermithor, unridden since the death of King Jaehaerys.

- Fire and Blood "The Dying of the Dragons: The Blacks and the Greens"

Munkun’s True Telling tells us that sixteen men lost their lives during the Sowing. Three times that number were burned or maimed. Steffon Darklyn was burned to death whilst attempting to mount the dragon Seasmoke.

- Fire and Blood "The Dying of the Dragons: The Red Dragon and the Gold"

Yet Seasmoke, Vermithor, and Silverwing were accustomed to men and tolerant of their presence. Having once been ridden, they were more accepting of new riders.

- Fire and Blood "The Dying of the Dragons: The Red Dragon and the Gold"

And Seasmoke, who had once borne Laenor Velaryon, took onto his back a boy of ten-and-five known as Addam of Hull, whose origins remain a matter of dispute amongst historians to this day.

- Fire and Blood "The Dying of the Dragons: The Red Dragon and the Gold"

Having outlived all of his children and suffered the betrayal of his nephews and cousins, the Sea Snake seemed more than eager to accept these newfound grandsons. And when Addam of Hull mounted Ser Laenor’s dragon, Seasmoke, it seemed to prove the truth of his mother’s claims.

- Fire and Blood "The Dying of the Dragons: The Red Dragon and the Gold"

It is one thing to face a dragon, another to face five. As Silverwing, Sheepstealer, Seasmoke, and Vermithor descended upon them, the men of the Triarchy felt their courage desert them. The line of warships shattered, as one galley after another turned away. The dragons fell like thunderbolts, spitting balls of fire, blue and orange, red and gold, each brighter than the next. Ship after ship burst asunder or was consumed by flames. Screaming men leapt into the sea, shrouded in fire. Tall columns of black smoke rose up from the water. All seemed lost…all was lost…

- Fire and Blood "The Dying of the Dragons: The Red Dragon and the Gold"

- Season 1 Episode 3 -

- Season 2 -

- Season 3 Episode 1 -