An Ancient Egyptian priest called Imhotep is revived when an archaeological expedition finds Imhotep's mummy and one of the archaeologists accidentally reads an ancient life-giving spell. Imhotep escapes from the archaeologists, taking the Scroll of Thoth, and prowls Cairo seeking the reincarnation of the soul of his ancient lover, Princess Ankh-es-en-amon.
Imhotep finds two archaeologists, claims that his name is Ardath Bey, a modern Egyptian, and shows them where to dig to find Ankh-es-en-amon's tomb. The archaeologists find the tomb and give the mummy and the treasures to the Cairo Museum. The archaeologists thank Imhotep for giving them the information of where to find the tomb.
Imhotep was once mummified alive for attempting to resurrect her, and, upon finding a woman bearing a striking resemblance to her, attempts to mummify her and make her his bride. In the end, she is saved when she remembers her past life and prays to the goddess Isis to save her. The young woman utters a prayer and the scroll containing the resurrection spell is burned, and Imhotep dissolved.