Casting rumors about the third season of "Game of Thrones" have been swirling for weeks, and HBO finally put fans out of their speculation misery at Comic-Con by confirming the identities of more than a dozen actors who'll be joining the series in Season 3.

Diana Rigg of the classic British series "The Avengers" joins "Game of Thrones" as Lady Olenna Tyrell, "The Queen of Thorns." She is the grandmother of the aristocrats Loras and Margaery Tyrell and the matriarch of the powerful Tyrell clan. (Nerds may already be aware that Rigg and her daughter are appearing in the upcoming season of "Doctor Who.")

Mackenzie Crook, best known for his roles on the U.K. version of "The Office" and "Pirates of the Caribbean," will play the wildling raider Orell, who, according to HBO, "is a 'warg' or 'skinchanger,' with the ability to enter the mind of an animal and control its actions."

Fans have been eagerly awaiting casting news about Bryndon Tully, a.k.a. The Blackfish, and now, Clive Russell has been confirmed to play the much-anticipated character. The Blackfish is Catelyn Tully's famously valiant uncle, who was estranged from her father, Lord Hoster Tully, for years.

And if you're dying to know when "Game of Thrones" will return, HuffPost TV's Laura Prudom attended the San Diego Comic-Con panel for the show and has the Season 3 premiere date as well as lots more scoop on the HBO drama.

Back to casting: The following names and character descriptions for "Game of Thrones" Season 3 come from HBO's Friday press release:

  • Nathalie Emannuel will play Missandei. "Originally from the peaceful island of Naath, Missandei was sold into slavery as a child, along with her brother. She received education in various languages and became a translator to the slave trader Kraznys in Astapor."
  • Kerry Ingram will play Shireen Baratheon. Shireen is "the only child of Stannis Baratheon. An avid reader, she escapes her lonely life through myths and stories –- her books are her most treasured possessions."
  • Paul Kaye will play Thoros of Myr. "A key member of the outlaw band known as the Brotherhood Without Banners, he is a Red Priest, in service of the Lord of Light, and originally hails from the Free City of Myr, in Essos."
  • Thomas Brodie-Sangster will play Jojen Reed, "a mysterious and enigmatic young man who becomes an important ally to Bran Stark."
  • Ellie Kendrick will play Meera Reed. "The eldest daughter of Howland Reed and a staunch Stark loyalist, Meera and her younger brother Jojen seek out Bran Stark to protect him on his hard journey north."
  • Richard Dormer will play Beric Dondarrion. "Once the lord of Blackhaven and a celebrated warrior, Lord Beric has now become the leader of the Brotherhood Without Banners, a band of vigilante outlaws." 
  • Kristofer Hivju will play Tormund Giantsbane. "A famed wildling warrior and chief lieutenant of the 'King Beyond the Wall,' Mance Rayder, Tormund is fearsome and strong, with a large build and a beard to match."
  • Philip McGinley will play Anguy, "an extremely skilled archer and key member of the outlaw band known as the Brotherhood Without Banners."
  • Tara Fitzgerald will play Selyse Baratheon. "The wife of Stannis Baratheon, Selyse spends much of her life in seclusion, shut away in a gloomy tower."
  • Tobias Menzies will play Edmure Tully. "The younger brother of Catelyn Stark, Edmure has recently become Lord of Riverrun in the wake of his father’s death."
  • Anton Lesser will play Qyburn, "a former maester of the Citadel, who was stripped of his chain many years ago."

Check out the video released Friday at San Diego Comic-Con, which highlights many of the new cast members:

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  • 'Game Of Thrones' Season 3

    Jack Gleeson as Joffrey Lannister, Natalie Dormer as Margaery Tyrell

  • 'Game Of Thrones' Season 3

    Emilia Clarke as Daenerys Targaryen

  • 'Game Of Thrones' Season 3

    Sophie Turner as Sansa Stark

  • 'Game Of Thrones' Season 3

    Conleth Hill as Lord Varys, Diana Rigg as Olenna Redwyne

  • 'Game Of Thrones' Season 3

    John Bradley as Samwell Tarly

  • 'Game Of Thrones' Season 3

    Aidan Gillen as Petyr Baelish, Conleith Hill as Lord Varys, Julian Glover as Grand Maester Pycelle

  • 'Game Of Thrones' Season 3

    Noah Taylor as Locke, Nikolaj Coster-Waldau as Jaime Lannister

  • 'Game Of Thrones' Season 3

    Jack Gleeson as Joffrey Baratheon

  • 'Game Of Thrones' Season 3

    Esmé Bianco as Ros

  • 'Game Of Thrones' Season 3

    Noah Taylor as Locke

  • 'Game Of Thrones' Season 3

    Nikolaj Coster-Waldau as Jaime Lannister, Gwendoline Christie as Brienne of Tarth

  • 'Game Of Thrones' Season 3

    Nikolaj Coster-Waldau as Jaime Lannister, Gwendoline Christie as Brienne of Tarth

  • 'Game Of Thrones' Season 3

    Richard Madden as Robb Stark, Michael McElhatton as Roose Bolton

  • 'Game Of Thrones' Season 3

    Nathalie Emmanuel as Missandei, Emilia Clarke as Daenerys Targaryen

  • 'Game Of Thrones' Season 3

    Sophie Turner as Sansa Stark, Finn Jones as Loras Tyrell

  • 'Game Of Thrones' Season 3

    Natalie Dormer as Margaery Tyrell, Diana Rigg as Olenna Redwyne, Sophie Turner as Sansa Stark

  • 'Game Of Thrones' Season 3

    Rose Leslie as Ygritte, Kit Harington as Jon Snow

  • 'Game Of Thrones' Season 3

    Kristofer Hivju as Tormund

  • 'Game Of Thrones' Season 3

    Emilia Clarke as Daenerys Targaryen, Nathalie Emmanuel as Missandei, Dan Hildebrand as Kraznys mo Naklaz

  • 'Game Of Thrones' Season 3

    Sibel Kekilli as Shae, Sophie Turner as Sansa Stark, Aidan Gillen as Petyr Baelish

  • 'Game Of Thrones' Season 3

    Peter Dinklage as Tyrion Lannister

  • 'Game Of Thrones' Season 3

    Natalie Dormer as Margaery Tyrell

  • 'Game Of Thrones' Season 3

    Maisie Williams as Arya Stark

  • 'Game Of Thrones' Season 3

    Joe Dempsie as Gendry, Maisie Williams as Arya Stark, Ben Hawkey as Hot Pie

  • 'Game Of Thrones' Season 3

    Richard Madden as Robb Stark

  • 'Game Of Thrones' Season 3

    Peter Dinklage as Tyrion Lanniser, Jerome Flynn as Bronn, and Daniel Portman as Podrick Payne

  • 'Game Of Thrones' Season 3

    Richard Madden as Robb Stark

  • 'Game Of Thrones' Season 3

    Nikolaj Coster-Waldau as Jaime Lannister

  • 'Game Of Thrones' Season 3

    Clive Russell as Brynden "The Blackfish" Tully

  • 'Game Of Thrones' Season 3

    Gwendoline Christie as Brienne of Tarth

  • 'Game Of Thrones' Season 3

    Charles Dance as Tywin Lannister

  • 'Game Of Thrones' Season 3

    Sophie Turner as Sansa Stark

  • 'Game Of Thrones' Season 3

    Richard Dormer as Beric Dondarrion

  • 'Game Of Thrones' Season 3

    Dianna Rigg as Olenna Tyrell

  • 'Game Of Thrones' Season 3

    Lena Headey as Cersei Lannister

  • 'Game Of Thrones' Season 3

    Richard Madden as Robb Stark, Oona Chaplin as Talisa Maegyr

  • 'Game Of Thrones' Season 3

    Emilia Clarke as Daenerys Targaryen

  • 'Game Of Thrones' Season 3

    Peter Dinklage as Tyrion Lannister

  • 'Game Of Thrones' Season 3

    Michelle Fairley as Catelyn Stark

  • 'Game Of Thrones' Season 3

    Jack Gleeson as Joffrey Baratheon, Natalie Dormer as Margaery Tyrell

  • 'Game Of Thrones' Season 3

    Ciaran Hinds as Mance Rayder

  • 'Game Of Thrones' Season 3

    Carice van Houten as Melisandre

  • 'Game Of Thrones' Season 3

    Stephen Dillane as Stannis Baratheon

  • 'Game Of Thrones' Season 3

    Rose Leslie as Ygritte

  • 'Game Of Thrones' Season 3

    Kit Harington as Jon Snow

  • 'Game Of Thrones' Season 3

    Isaac Hempstead Wright as Bran Stark

  • 'Game Of Thrones' Season 3

    Ellie Kendrick as Meera Reed

  • 'Game Of Thrones' Season 3

    Thomas Brodie Sangster as Jojen Reed

  • 'Game Of Thrones' Season 3

    Maisie Williams as Arya Stark

  • 'Game Of Thrones' Season 3

    Paul Kaye as Thoros

  • 'Game of Thrones' Character Posters

    Peter Dinklage as Tyrion Lannister.

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