We've already seen a teaser trailer for 'How to Train Your Dragon 2,' but we've known little about the voice cast this time around. During DreamWorks Animation's panel at Comic-Con this afternoon, the studio made a big casting announcement for the sequel, with actors Cate Blanchett, Kit Harington, and Djimon Hounson joining the line-up.

Kit Harington is no stranger to dragons, given his role on HBO's 'Game of Thrones' (though his character hasn't interacted with one ... yet). But Harington, and fellow announced co-stars Blanchett and Hounsou will soon be interacting with dragons -- in an animated capacity, anyway. The trio of stars were all announced at the panel, but only Harington made an appearance. The actor is also at Comic-Con this week to promote the upcoming film 'Seventh Son,' as well as 'Game of Thrones.'

Blanchett will voice a feral vigilante who tries to liberate dragons, while Hounsou will play the part of a dragon hunter, and Harington will voice a fellow who helps Hounsou's character trap the dragons.

The official synopsis:

The thrilling second chapter of the epic "How to Train Your Dragon" trilogy brings back the fantastical world of Hiccup and Toothless five years later. While Astrid, Snoutlout and the rest of the gang are challenging each other to dragon races (the island's new favorite contact sport), the now inseparable pair journey through the skies, charting unmapped territories and exploring new worlds. When one of their adventures leads to the discovery of a secret ice cave that is home to hundreds of new wild dragons and the mysterious Dragon Rider, the two friends find themselves at the center of a battle to protect the peace.

'How to Train Your Dragon 2' hits theaters in 2D and 3D on June 20, 2014.