The new season will also include Ramona Young as Alaska Yu, Courtney Ford as Nora Darhk, Matt Ryan as John Constantine and Tom Wilson as Hank Heywood.
With no evidence to back up her theory, the Legends must decide if they should trust her and go against the Bureau.
When the Legends let time crumble in order to release and defeat Mallus, the barrier between worlds softened.
Mona tries to convince the Legends and the Bureau that the people responsible for releasing the fugitive were some mysterious Men in Black and not her.