Martha Thomas, played by Desiree Gould, is a character in the film Sleepaway Camp.
Martha is a mentally deranged woman who forges her neice Angela Baker's physical so she can attend Camp Arawak with Martha's son, Ricky.
It is revealed later that after the boating accident that killed John Baker, the real Angela Baker died too. Instead Peter Baker survived and Martha raised her like a daughter. Eventually Peter took the place of Angela.