Gerda and Gamli were easy to miss in the first two seasons. They existed around Durin and Disa's domestic life in Khazad-dûm, but the series deliberately kept them young, peripheral and often visually obscured.
The new season skips five years forward, which makes that arrangement impossible to maintain. A new Prime Video image presents the siblings as teenagers beside their parents. Amber Mendez-Martin has been cast as Gerda, while Lee Braithwaite plays Gamli.
Their family has inherited more than a throne
Durin IV is no longer simply a prince arguing with his father. Durin III's death at the end of Season 2 leaves Durin and Disa leading Khazad-dûm themselves, and their children have spent the intervening years watching that new royal household face an increasingly dangerous Middle-earth.
Prime Video says Gerda and Gamli will become important to the unrest developing within the mountain kingdom. That is a more consequential introduction than simply using the time jump to give two familiar background children older costumes.
The Dwarven storyline has repeatedly been about inheritance: Durin IV trying to respect his father without becoming him, the pressure of the royal name and the consequences of decisions made deep beneath the mountain. Season 3 can now examine the same problem from the other direction.
The show has considerable freedom with both teenagers
Gerda and Gamli are not characters accompanied by detailed Tolkien biographies that dictate every stage of their lives. They belong to the series' effort to fill the large historical spaces around the Second Age with families and personal relationships.
Teenage Dwarves are unusual territory for a screen adaptation of Middle-earth in their own right. Previous films and television stories have shown plenty of adult Dwarves and their dynasties while saying very little about the years between childhood and adulthood.
That makes the siblings useful for something more mundane than another royal succession chart. They can show what growing up inside Khazad-dûm looks like while the kingdom is approaching a period its audience already knows will eventually end badly.
Five years need to leave marks
Season 3 begins five years after Eregion's fall. By then Sauron's armies have expanded their war across Middle-earth, with Khazad-dûm and the protected Elven realms among the remaining centers of resistance.
The aging of Gerda and Gamli gives that otherwise enormous time jump a small human — or rather Dwarven — scale. The audience can see years in the faces and responsibilities of one family before the series starts explaining what changed on the wider map.
Elsewhere, Sauron is working toward the One Ring from Barad-dûr. Season 3 also introduces Jamie Campbell Bower as Celeborn, Zubin Varla as Khamûl, Eddie Marsan as Thrain and Andrew Richardson as Anarion.
Season 3 arrives in three batches
The third season contains eight episodes. Prime Video will release the first four on November 11, 2026, episodes five and six on November 18, and the final pair on November 25.
By the time the season begins, Durin and Disa will have been ruling Khazad-dûm for five years. Gerda and Gamli are no longer being kept outside that story.
