Myra Mason became an accomplished nurse working in the New York City area during the early years of World War II. Her work eventually placed her in the employee of eminent surgeon, Doctor Charles McNider. Mason became Charles' most trusted aide, and often assisted him in his research into anti-viral procedures. During their time together, Myra slowly began to fall in love with McNider, but was always reluctant to voice her affections out loud.
Mason and McNider grew even closer together, after the latter suffered from a horrible accident which rendered him blind. Realizing that his career as a surgeon was over, McNider chose to focus his energy into writing magazine articles exposing organized crime figureheads. Myra became Charles' eyes, and typed all of his articles for him. What Myra never realized however, was that Charles was also leading a secret life. Although he was in all other aspects blind, McNider possessed perfect night vision and adventured as the mystery man known as Doctor Mid-Nite. Myra often found herself involved with Mid-Nite's adventures, and helped Charles write articles chronicling the dark avenger's escapades. McNider eventually found himself romantically drawn to Mason, but realized that he could never pursue a romance with her so long as he continued to operate as Doctor Mid-Nite. He would later write in his journals of his love for Myra.
In 1953, a serial killer calling himself the Shadower discovered the (now retired) Doctor Mid-Nite's secret identity. Seeking to strike at Mid-Nite through his loved ones, he went after Myra Mason. The Shadower strangled Myra and left her body for McNider to find. Charles was devastated by the event, and dedicated over a decade of his life towards tracking down Myra's killer. Eventually, he captured the Shadower and avenged Myra's death.
- Although this character was originally introduced during DC's Earth-Two era of publication, their existence following the events of the 1985–86 limited series Crisis on Infinite Earths remains intact. However, some elements of the character's Pre-Crisis history may have been altered or removed for Post-Crisis New Earth continuity, and no longer apply.
- 51 Appearances of Myra Mason (New Earth)
- 2 Images featuring Myra Mason (New Earth)
- Quotations by or about Myra Mason (New Earth)
- Character Gallery: Myra Mason (New Earth)