As it was revealed in a storyboard shared by Zack Snyder back in October, in the scene, once Lois leaves Martha, she would transform into Martian Manhunter, who would also be played by Harry Lennix, who DCEU viewers already knew as General Swanwick. The Blacklist star would debut as the famed Justice League member to the big screen in the Snyder Cut.
Article source: https://www.cinemablend.com/news/2493893/new-snyder-cut-images-bring-back-lois-lane-and-martha-kent