A former colleague of Dorn joins the investigation into the theft of polonium from a British nuclear power plant.
While Emma and Elsa attempt to take down the Snow Queen, the other citizens of Storybrooke are consumed with hatred for each other. Meanwhile, Will prepares to settle his debt with Hook, and Gold plans his escape.moreless
As the Snow Queen's spell closes in on Storybrooke, the townspeople prepare for the worst. Elsa tries to find her sister, who may be the only chance of a cure. However, Gold has his own plan underway to save himself, Belle, and Henry, and is willing to sacrifice everyone else to assure their escape. In the past, Anna and Kristoff attempt to find the Wishing Star so that they can recover Elsa.moreless
Rather than hurt her family and friends, Emma seeks out Gold to find a way to remove her magical powers. Meanwhile, Robin asks Will to help him find a way to ensure Regina's happy ending. In the past, Ingrid tries to turn Elsa against Anna but fails, and the sisters try to trap their aunt in the urn.moreless
Emma prepares to remove her powers to protect her loved ones, unaware that Gold plans to trap her in the Sorcerer's Hat. Meanwhile, Robin finds a clue that may provide Regina with her happy ending. In the past, Ingrid turns Anna against Elsa but the results aren't what she expects.moreless
Emma captures and questions the Snow Queen, who uses the opportunity to turn her against her family. Meanwhile, Regina and Robin continue trying to find a way to save Marian, and Henry continues his undercover mission to find out what Gold is hiding. In the past, the mystery behind Ingrid's powers is revealed.moreless
Belle tries to use Gold's dagger to force him to locate the Snow Queen, so that the townspeople can find out her plans and learn why she wiped Emma's memories. In the past, Belle convinces Anna to take her to Grand Pabbie so that she can recover her memories of her mother Colette.moreless
Sidney agrees to lead Regina to the Snow Queen, and Emma insists on tagging along in the hopes of rekindling her friendship with Regina. Meanwhile, David and Mary Margaret interrupt their first date since the baby arrived to track down an escaped Will. In the past, Emma befriends a fellow orphan, Lily, but learns that she's not what she claims.moreless
Emma asks Hook to go on a date with her, and he bargains with Gold to get his left hand back so that he can hold Emma with both hands. Meanwhile, Emma continues her hunt for the Snow Queen, and Will breaks into the Storybrooke Library to get a very special book. In the past, Anna makes a deal with Rumplestiltskin to learn what her parents were seeking in the Enchanted Forest.moreless
Someone casts a freezing spell on Marian and the townspeople believe that Elsa is responsible... unaware that the Snow Queen is the real perpetrator. Meanwhile, Emma and David meet an old friend of Robin's, while Regina and Henry set out to find the author of Henry's storybook. In the Arendelle of the past, Elsa and Kristoff must join forces to stop Hans from conquering the country.moreless
Elsa accidentally endangers Emma's life when her ice powers go out of control again. Meanwhile, when Regina goes into seclusion, Mary Margaret takes charge of the town and faces her first crisis. In the past, Anna meets David and helps him learn to fight for what is his against a brutal warlord... the dreaded Bo Peep.moreless
Priscilla fights her way back to reality with the help of Aaron and Rachel. Trueman's atrocities escalate as he tries to stop the resistance. Bass and Miles kidnap the President.
With his wife and son now dead, Neville joins with Bass to seek his revenge on the patriots. Rachel finds out about Priscilla, and Miles and Charlie pinch a steam train.
Charlie finds Miles and Truman gets his shot to get Miles and Bass.
Miles gets injured fighting off a bunch of Sheriffs and then gets inadvertently trapped in a dilapidated building making his way back to camp. Tom kidnaps Charlie and discovers the truth about Jason.moreless
After receiving inside information from Jason, Miles and Monroe head to Austin to try and sabotage the Patriots' plans. Aaron becomes concerned over Priscilla's odd behavior.
Monroe makes a jolting attack on the Patriots while Gene and Miles look for potential allies in Willoughby. Neville and Jason find themselves in deep water when Doyle finds out about the poison. Aaron and Priscilla press onward.moreless
The town of Willoughby has been turned into a reeducation facility, and Doyle makes things difficult for Tom.
Aaron awakes from slumber to find himself back in his previous life, in a world with power. Something however, is not quite right.