Biography: a British actress and model who has played complex characters in film and television. She's known for her roles as Nyssa-Vex in Krypton, Kate Kane in Batwoman, and Agent Shin in Infinite. Day has also appeared in Casanova, Jekyll and Hyde, and Trollied. Day developed a passion for acting at age five after seeing ballets with her father. She trained at the Sylvia Young Theatre School and the Arts Educational Schools, London.