TMDb/Sullivan's Crossing Celebrity Major cast changes hit Sullivan's Crossing for Season 4. Can Maggie's life and love with Cal survive the shocking twists ahead? April 22, 2026 AceShowbiz - Sullivan's Crossing has experienced significant cast departures, including the surprising exit of Scott Patterson, ahead of its upcoming fourth season. The popular series, based on Robyn Carr's book series, follows neurosurgeon Maggie, portrayed by Morgan Kohan, as she returns to her rural Nova Scotia hometown to reconnect with her estranged father, Sully, played by Scott Patterson.