To the present and Storybrook where Emma is still shooting off magical sparks in her car. Henry tracks her down (somehow) telling her how running from people never fixes anything so she zaps him with magic (accidentally. Honest :P) Henry tries to reassure her but Emma panics and tells him he has to leave.
To be fair, if I were Emma I'd have trouble not zapping my blood relatives as well.
Ingrid drops in to do her recruitment pitch but Emma drives off.
The Charmings, Elsa and Killian gather together for angst and whining, as they do and Henry joins them to explain how pear shaped everything has become. Elsa decides to exposition which throws us into flashback world where Ingrid told Elsa a somewhat edited version of events on how their sisters will always hate them for being magic and special and occasionally freezing people to death. Anna is in prison and totally evil.
Elsa goes to the prison, gets rid of the guards and makes it clear that she doesn't believe aunty Ingrid and is definitely team Anna. They hatch a plan to put Ingrid in the urn. They go searching for the urn ("helped" by Kristoff and Anna) and find the urn (and Hans's frozen body).
They work their way through the castle, hiding from the guards (for some reason) while Elsa angsts about her parents trying to take away her magic while Anna tells her how her magic makes her special and she loves her sister with magic.
Sadly for them, Ingrid outsmarts Anna (which, admittedly, is not exactly a difficult feat) and chains Anna up. They then discuss old legends including the creation of the magic mirror that makes whole kingdoms hate each other. She uses a piece of the hate mirror on Anna. Angry Anna goes to confront Elsa with the Urn but Elsa rightly realises Anna has been spelled. Ingrid tells her to freeze Anna - and Elsa refuses. Anna puts Elsa in the urn
Ingrid isn't happy with this turn of events and plays to the idea she's being persecuted because Anna and Kristoff look at her like she's a monster (hah must be all the monstrousness). Ingrid freezes the whole castle - Anna and Kristoff included. This may have killed them - or so Rumplestiltskin thinks when he appears. He wants the hat Anna took from him and to make sure he gets it, he vanishes the urn full of Elsa Ingrid has. Oh Rumplestiltskin, the source of all the evil everywhere!