Emma, Henry and Mr. Gold search for Gold's son in New York; Hook, Cora and Regina look for one of Rumplestiltskin's most precious possessions.
Investigating a lethal toxin that was unleashed on a wedding ceremony as a weaponized experiment, Walter uncovers an alarming formula that reveals a link to the Bishop family tree.
Following the dramatic shift in violent animal behavior, the team attempts to rescue Jamie and the leopard whose DNA may hold the key to curing the animal crisis.
