Warner Animation Group (WAG) is developing an adaptation of Game of Thrones creator George R.R. Martin’s The Ice Dragon.

It’s a family film based on a pre-GoT children’s novella that Martin wrote in 1980. The dragon-filled medieval fantasy follows the relationship between a young girl named Adara and a rare Ice Dragon, and their efforts to save Adara’s town from an invading horde of dragons.

Martin will produce, and his manager Vince Gerardis will executive produce.