After Clarke Griffin was the last human in her dimension the Judge gave Clarke the chance to be with Lexa and Finn, Clarke without hesitation accepted. Clarke and her dog, Picasso were transported to a dimension where Lexa was reincarnated into Mary Brown and Finn reincarnated into Trevor. Lexa was the Heda and Clarke’s true love and Finn was Clarke’s first love both physically died 6 years ago.

Mary Brown was a 17 year old girl prophesied to become possessed by the devil when she turns 18 and become his soldier with unimaginable power. Mary’s mom is Susan Brown who is the devil’s servant, Jacob Brown is her Christian father, and Rebekah is Mary’s “evil” stepmom. Mary was raised in a Christian Amish-like community and forbidden to leave and forced to become a disciple of elder Beacon in an attempt to prevent the devil’s possession.

Mary has worsening seizure episodes and during those seizures she has demonic visions of the prophecy.

Mary was always a good daughter, innocent and a good church girl but she had a rebellious streak when it came to Trevor, sneaking off and being all romantic despite it being forbidden.

Now in the present Clarke was now 18 the same age as Lexa/Mary. Clarke opens a door stumbling out the closet and seeing Mary/Lexa and Trevor/Finn getting it on. Clarke interrupts. Lexa wtf?!

Both Mary/Lexa and Trevor/Finn jump in shock and confusion but the Judge quickly comes and restores their memories of their past lives and turns Mary into a Nightblood then without further explanation dips.

Mary/Lexa gasps omg church turned me straight! Klark, I… I’m so sorry about… I didn’t mean to be unfaithful or…

Clarke runs over and hugs Lexa/Mary and cries Shut up, you idiot, I know it wasn’t you! I’ve missed you so much Lexa!

Finn/Trevor groans Great I lost 2 girlfriends simultaneously.

Mary/Lexa replied Klark loves me more! But Klark you should know I’m going to be possessed by the devil when I turn 18.

Trevor/Finn scoffs You just turned 18.

Lexa/Mary snorted Of course the church thinks I’m the devil

Clarke sighs in relief I’m just happy the prophecy was really about you becoming Lexa all along