A surprise visit from Hook's brother Liam may provide Hook and Emma with the tools they need to defeat Hades; and in flashbacks, the bond between the Jones Brothers is tested as their merchant ships head into a storm.
Hook and Emma must defeat Hades in order to return to Storybrooke with Snow, David, Regina, Robin, Henry, and Gold. A surprise visit from Hook's departed brother Liam just might provide the lead they were looking for. Meanwhile, Hades redoubles his efforts to trap the heroes in the Underworld by playing them against one another.
In the Underworld, Hook is reunited with his older brother Liam. Liam offers to help the group find the Storybook and the pages containing Hades' weakness - and then makes a deal with the Lord of the Underworld. In the past, Liam leads a mutiny against Captain Silver, and makes a deal with Hades to ensure his success.—ahmetkozan