I’m very certain that the Regina/Maleficent Centric Episode is 4×13 due to the title, Unforgiven!
It will parallel the big flashback of them meeting and becoming best friends to present day enemies….
This will be the “Breaking Glass Emma/Regina” type episode but only with Regina/Maleficent, and Regina will be in Emma’s shoes considering she locked Mal underground for 30 years. I feel this may be veryyyyy emotional!
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"If you go as far as you can see...you will then see enough to go even further." - Finn Balor