Madame Rontru is a character in Abbott and Costello Meet the Mummy. She is a criminal who is looking for a sacred medallion in order to find the secret to a buried treasure. She offers to pay Lou $5,000 for the medallion, but he accidentally eats it first. After x-rays reveal the medallion's secret, she and her two henchmen set out with Bud and Lou to find the treasure.
After Rontru was attacked by Klaris, Costello accidently blows the mummy up with dynamite lit by Rontru. Afterwards she and her two sidekicks were arrested for attempting robbery.