Marinette has been suffering nightmare for weeks now. Tikki wants to Mairnette to talk to her friends however Marinette's made Tikki promise not to tell anyone. Including Alya, meanwhile Alya has been left in the dark. She wants to help out but Marinette is refusing to say anything. Alya is not only getting help from her friends at school but also from Chat Noir. It was a normally night when Marinette wake up a swear she saw Chat Blanc. However no one else can see it. She has been haunted by him for days and is convinced she is crazy. It's only when she sees more nightmares she learns that Sandboy has returned. Ladybug and Chat Noir try to fight him when they see him. Chat about is stunned and Ladybug is terrified.
4 parts