In this episode, the Locke family faces Captain Gideon, who has seized control of Keyhouse. The main conflict revolves around Gideon’s attempt to open a demonic portal and the family's desperate efforts to restore Bode to his original body.
'Locke & Key' Season 3, Episode 6 Recap: 'Free Bird' - Vulture
After assisting Bode, Sam’s ghost manages to jump into the unoccupied body of Gideon's henchman, James Bolton , effectively returning to the physical world to help the Lockes.
