"Courage Meets the Mummy" A Mayan mummy returns from the dead to seek revenge on the two people who wrongfully entombed him thousands of years ago -- two people who bore an uncanny resemblance to Muriel and the Farmer. "Invisible Muriel" A government facility captures Muriel after Courage gives her a magical gem that influences her to become invisible. The cure must be found in time for him to come to her aid.