Bakuryu Sentai Abaranger DELUXE: Abare Summer is Freezing Cold!.

The film opens on Dino Earth fifteen years ago with a village elder telling the story of how Princess Freezia sealed away a pair of evil Bakuryuu with the Holy Sword, encasing them in ice. If the evil creatures are ever released from their prison, the world will end in a grip of fear "encased in white".