In Episode 1 of the two-part special, one of Clark's students is named as a terrorist suspect after an explosion at a local power station.
In season 4, he begins working as a crooked lawyer to one of his clients, crime boss Elijah Stone, after Elijah helped him locate Lopez when she was kidnapped by La Fiera.
Season 4 should see Nolan complete his disciplinary extra training and begin the next step in his policing career.