HBO dropped the first trailer for His Dark Materials, the television adaptation of Phillip Pullman's series of fantasy novels.

A co-production between HBO and the BBC, the story follows an orphan named Lyra as she uncovers a plot involving stolen children and a mysterious substance called "Dust."

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Based on the trailer, the series will feature plenty of action, as one character states, "This is war." The trailer also gives us a look at many of the main characters and their daemons. One of the most popular characters from the novels, a talking polar bear named Iorek Byrnison, appears at the end of the trailer.

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Books in the His Dark Materials series are Northern Lights (or The Golden Compass), The Suble Knife and The Amber Spyglass. A film adaptation of The Golden Compass was released in 2007, but was met with many negative criticism. The film received both a BAFTA and an Academy Award for visual effects. The series has also seen both a radio and theater adaptation.

His Dark Materials is directed by Tom Hooper and stars Dafne Keen as Lyra, Ruth Wilson as Marisa Coulter, James McAvoy as Lord Asriel and Lin-Manuel Miranda as Lee Scoresby. It doesn't currently have a release date, but rumors suggest it will premiere sometime in 2019.