An antique dealer finds an ancient alchemist's device that provides eternal life. It becomes an object of obsession for him and a ruthless millionaire who has learned of it through his own…
- The film went over budget from the orignal $1,5 million to $2 million (the highest budget for a Mexican movie at the time). del Toro himself got the half million through loans and bank debts.…More
- Guillermo del Toro started writing on the script as early as 1984, where it was titled "Vampire of the Grey Dawn".
- The role of Jesus Gris was originally written for Max von Sydow.