It turns out that Dustin's girlfriend Suzie is real, as we hear her flirt with him through walkie using Cerebro. They share a magical duet together before she gives him Planck's constant for the code to access the gate-opening machine in the Russian base.
Throughout the season, Dustin also strikes a friendship with Lucas's baby sister Erica, a fellow nerd herself. He gives Erica Will's donation box with the infamous D&D set. We're excited to see what she'll do with her new goods.