See the Cast of House of the Dragon at the World Premiere

Olivia Cooke looked glamorous in a blue sequin Thom Browne gown, and accessorized with Garrard jewelry. Cooke is set to play Lady Alicent Hightower, the daughter of the Hand of the King, Ser Otto Hightower.

Emma D’Arcy embraced the oversized suit trend, and wore a Vetements look to the premiere. D'Arcy portrays Princess Rhaenyra Targaryen, the eldest child of King Viserys.

Milly Alcock stunned in an archival Alexander McQueen gown to the premiere. Alcock plays a younger version of D'Arcy's Princess Rhaenyra.

Toussaint, who portrays Lord Corlys Velaryon a.k.a. "The Sea Snake," was all smiles on the red carpet. The Velaryons are a notable change from Fire and Blood, the book that House of the Dragon is based on. In the TV show, they are a wealthy Black family.

Best plays Princess Rhaenys Velaryon, married to Toussaint's Lord Velaryon. She looked regal in a black corseted derss.

On the red carpet, Matt Smith was a picture of effortless cool. Smith makes his grand return to television after portraying Prince Philip on the first two seasons of the Crown. In House of the Dragon, he plays Prince Daemon Targaryen, the supposed heir to the throne.

Fabian Frankel opted for a gray suit. In the series, he plays play Ser Criston Cole, the common-born son of the steward to the Lord of Blackhaven. In the books, he is a knight who loves Princess Rhaenrya.

Emily Carey looked futuristic in her Givenchy Spring 2022 get up. She plays a young version of Cooke's Alicent Hightower.

Cooke (center) and D'Arcy (second from right) posed with the actresses who portray younger versions of their characters.

King Viserys himself, Paddy Considine. The Irish actor showed up to the premiere in a leather jacket.

Rhys Ifans opted, too, for a more casual outfit, forgoing a tie for the premiere. He plays Ser Otto Hightower, the Hand of the King.

Ifans and Alcock play father and daughter on the show, and they had a sweet reunion alongside Frankel on the carpet.

The Targaryen brothers wrapped their arms around each other.

They seemed elated to see each other.

Gavin Spokes, who portrays Lord Lyonel Strong, in a dashing gray suit. In the books, Lord Strong serves as an advisor to Viserys.

No spoilers, but these two play possible love interests.

Ramin Djawadi is not a member of the cast; he is the Game of Thrones composer, who is also scoring House of the Dragon.

Greg Yaitanes, an executive producer and director on House of the Dragon, paired sneakers with his suit.

House of the Dragon producer chose a fun blue suit.

Co-creator Miguel Sapochnik wore a casual black button down.

Other co-creator Ryan Condal dressed up a bit more, but went for an unbuttoned shirt look.

Matt Smith, Emma D’Arcy, Miguel Sapochnik, and Milly Alcock inside the premiere. Smith can't resist throwing up the peace sing.

Carey changed into a silver set inside the event.

Best and Toussaint played a married couple on the show. He wrote on Instagram, "At the #HOTD World Premiere with the 'wife', the extraordinary #EveBest Think it went well #HBO."