Lieutenant Mason was a nurse who made two appearances in M*A*S*H. The first was in Season 1 in The Army-Navy Game. This part was played by Bobbie Mitchell in the first of at least 9 different nurse characters that she would play from Season 1 to Season 5. The second appearance was in Season 2 in For the Good of the Outfit, this time played by Lesley Evans as the second of three nurse characters that she played in Season 2. It is not known if the two Lieutenant Masons are intended to be the same character.