Set just after the 2015 film, this time in the heart of the 1970s, a twelve-year-old Felonius Gru (Steve Carell) is growing up in the suburbs. A fanboy of a supervillain group known as the Vicious 6, Gru hatches a plan to become evil enough to join them. When the Vicious 6 fire their leader, legendary fighter Wild Knuckles (Alan Arkin), Gru interviews to become their newest member.
It does not go well, and things only get worse after Gru steals from them with the help of Kevin, Stuart, Bob, Otto, and the other Minions and suddenly finds himself the mortal enemy of the apex of evil. On the run, Gru and the Minions will turn to an unlikely source for guidance, Wild Knuckles himself, and discover that even bad guys need a little help from their friends.