The Aztec Mummy 1957

From Wiki- The Aztec Mummy (Spanish: La Momia Azteca) is a 1957 Mexican adventure horror film produced by Guillermo Calderon from his own story idea, scripted by Alfredo Salazar, and directed by Rafael Portillo. The plot centers on a group of scientists who uncover a secret Aztec tomb through past-life regression, only to awaken an ancient warrior who has been cursed to guard the tomb and its hidden treasures. It is the first of a trilogy featuring the titular character, all filmed back-to-back in order to increase potential profit. Back to me:

I have watched all four of these movies, though I sure don't remember much about this first one.  It is a little slow paced, though, and could have been ten minutes shorter.