From 4.05 "Breaking Glass", in flashback, Young Emma, Young Ella and Young Lily were running from Lily's father's car.
Freya/Priscilla: (voice over) "Previously on Worlds Colliding (Once Upon a Time)."
Young Emma looked at Young Lily. "I'm Emma, by the way. This is my sister, Ella."
Young Lily shook their hands. "Lily."
From 4.18 "Heart of Gold", on the phone, Zelena spoke to the others. "While your precious Robin and Derek think it's Derek's wide eyed ex, it's actually been Faye the entire time."
From 4.18 "Heart of Gold", in Neal's apartment, Zelena poured a potion onto Faye's hand.
Zelena: (voice over from 4.18 Heart of Gold) "I cooked up a surprise for Derek, Saphira and Faye."
Faye pulled her hand back in pain, gasping. "Mother, what the hell did you just do?"
Gold looked at the others. "One phone call from me, and your beloved Derek and Robin die at the hands of Zelena. Faye is still just as insane. And Faye can still suffer just as much s Derek, Robin and Roland."
From 4.17, 4.18 & 4.19, there were flashes of Freya and Jefferson struggling to control their madness, and flashes of Grace losing control of her powers.
Gold: (voice over from 4.18 Heart of Gold) "Freya, Jefferson and Grace will continue to lose control to Cilla and Jefferson's madness, to Grace's Illusionist powers, until they stand down from my plan."
From 4.17, 4.18 & 4.19, there were flashes of Gold completing the link reversal spell on Lisa and Blake to Dark Bringer and Light Being, and how much they had both changed since it began.
Gold: (voice over from 4.18 Heart of Gold) "To use Blake's darkness to turn Lisa completely dark so she can do what I need her to."
From 4.19 "Sympathy for the De Vil", in the woods, Alcina, Regina, the Matthews and Belle confronted Gold. Regina was holding Belle's heart.
"This was Belle's idea," Tori told him.
"So that's why we found a spell that could make her stop loving you," Mathias told her.
Alcina walked closer to give Gold a cold look. "So I'm headed to New York now. With Tori, Saphira and Mathias. And if you breathe one word of this to Zelena, or if you have whoever you have looking after Faye to kill her, Robin or Derek or Roland, you won't have anyone left to love you."
From 4.19 "Sympathy for the De Vil", in the Hatter House, Freya was explaining. "Mathias if Maleficent's son. Saphira and Faye are her granddaughters. Tori's her daughter-in-law."
From 4.17 "Best Laid Plans", in the dining room of the Hatter House, Maleficent looked at the Matthews. "Saphira, Tori, I was warned that Mathias and Lily being around each other could have dangerous effects on all the darkness inside each other, but if he was having such a tough time controlling his inner darkness before he had you two, what do you think Lily has been going through this entire time, alone?"
From 4.17 "Best Laid Plans", in the street, David looked at Snow. "Lisa is strong enough as a Light Bringer who can't physically harm anyone because of how pure she is, but if they turn her dark, and switch her light for Blake's darkness, then she will be nearly unstoppable. Someone as pure as Lisa will not be able to handle Blake's darkness for long before she does something we'll all regret."
From 4.19 "Sympathy for the De Vil", on the cliff, Cruella had used her power to turn Dragon!Saphira and Dragon!Mathias against the others, threatening Henry.
Snow: (voice over from 4.19 Sympathy for the De Vil) "Cruella can't kill anyone? She's defenseless."
Lisa used magic to push Cruella away from Henry. Due to the cliff shaking because of Grace's magic, Cruella fell off the cliff, falling to her death with a scream.

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Worlds Colliding (Once Upon a Time) Book Four
FanfictionFreya Gold (Priscilla) played by Nina Dobrev Ella Swan played by Candice Accola/King Lisa (Vasilisa) played by Katherine McNamara Rose Mills (Enchantress) played by Ashleigh Craig Jefferson (Mad Hatter) & Grace (Illusionist) Alcina Mills (Dark Sorce...