Ultraman Ace: S1 E24 - Behold! Midnight Transformation
Kenta's mother Yoshiko starts behaving erratically ever since she was soaked by red rainfall. One night, Yoshiko leaves her bed, and speaks to Terrible-Monster Mazarews as if it was her own son. This was part of the plan devised by the remnants of the Yapool, the Mazaronians.