S4·E13 Farewell, O-O-O-No Shinnosuke
Aired August 23, 2017
Synopsis
Fumie's fury brings Shinnosuke and his parents back to their senses, but the Monster President emerges from the Mayor's body and shows its humongous true form. As the evil monster heads towards the town, Fumie and Shinnosuke put forth their final effort to stop it from destroying the world. The final battle between the Monster Busters and the most evil monster begins!