With Mallus at large on Legends of Tomorrow Season 3 Episode 10, the team is tasked with saving a girl from his possession when Constantine shows up to ask Sara for help.
After Sara's trip to the spirit world during the mid-season finale, Mallus is after Sara and her soul, and he spends the episode attempting to weaken Sara to make her prime for demonic possession.
Constantine is set on using the Legends to help him stop Mallus after discovering the girl he's trying to save is being controlled by Mallus. Unfortunately, the task isn't so simple when they realize the girl locked up in the asylum is Nora Darhk, the daughter of the evil Damien Darhk.
Now, the Legends have to attempt to save Nora from Mallus to prevent the hatred she holds for the team and the resurrection of her father, so this entire mess could be cleared up. Meanwhile, Ray and Zari take Nora out on the town to save her from going more crazy at the institution, but their plan backfires when a video recording of Oliver killing Damien is played on the news, drawing Nora back into her weakness and letting Mallus take free control.