Art reflected life in Season 3, as the global pandemic took an emotional toll on many of this drama's main characters. As Season 4 opens, though, look for the group of friends to reunite in uplifting, aspirational ways as they resume their old pattern of pulling together in the face of challenges. Emerging from her shattered marriage, Katherine (Grace Park) continues her journey of self-discovery, with Maggie (Allison Miller) likewise reaching new heights in her mission to help people. David Giuntoli, Romany Malco and James Roday Rodriguez also return.