The Beauty who Disappeared in the Mystery Mist (ミステリー霧に消えた美女 Misuterī kiri ni kieta bijo) is the 121st episode of Dr. Slump Arale-chan.
Synopsis[]
Famous singer Midori disappeared in Fog City. So, a famous detective Senbei and his assistant Arale start searching for her. They use a robot dog to find Midori but the dog takes them to Spako's room!