Board Thread:Character Discussion/@comment-28282242-20160423112213

So, I saw on a spoiler board Lexa would be in the S03 finale. Is it a flashback, is she in the city of light, or is the actress who plays Lexa, Alycia Debnam-Carey, also set to play Luna?

That would also wrap up the reason why Luna fled her conclave with no reprocussions. Neither sister wanted to fight to the death and Lexa refused to let anyone hunt her down.

Thought? Other wild theories? 