Gru's most recent crisis commences with his attendance at a high school reunion at his supervillain alma mater in a francophone European location. The LPB, or Lycée Pas Bon, is a mountain castle, where the Class of '85 has gathered. Gru, who had previously switched sides to work for the forces of good, faces a new adversary: former classmate and relentless foe Maxime Le Mal. Maxime possesses a weapon capable of transforming all mammals into cockroaches, including humans. When he launches an attack on Gru, his wife Lucy, stepchildren and baby, the entire family must be relocated to a new city under assumed identities. In this new, mundane suburban setting, Gru is taken aback to encounter the neighbor's child, Poppy, who has a proposition for him.
