In this sequel, the truce between humans and the magical underworld breaks. Prince Nuada, the ruthless elf prince, awakens the unstoppable —a mechanical legion of warriors—to destroy humanity. The Bureau for Paranormal Research and Defense (BPRD) sends Hellboy, Abe Sapien, and Liz Sherman to stop him. The film is famous for its practical makeup effects, the tragic love story of Nuada, and Hellboy’s hilarious drunk sing-along.