Superman star Edi Gathegi unveiled the physical and mental process he underwent to become Michael Holt/Mister Terrific. The actor will be the first to play the hero in a live-action theatrical project, marking a huge milestone for the character. Mister Terrific previously appeared in several animated and television projects, including the Arrowverse, in which Echo Kellum portrayed him. In addition to Gathegi, Superman stars David Corenswet, Nicholas Hoult, Rachel Brosnahan, Nathan Fillion, Isabela Merced, Sara Sampaio, Wendell Pierce, Skylar Gisondo, and Frank Grillo, among others.