Sarah Primm was a nurse who cared for the infant twins Billy and Mary Batson following the deaths of their parents. Primm switched Mary for the dead infant daughter of the wealthy Bromfields. On her deathbed, Primm revealed this to Billy Batson who had by this point begun his career as Captain Marvel. Shortly after Primm's death, Mary Batson Bromfield joined her brother in the Marvel Family as Mary Marvel.
- This version of Sarah Primm, including all history and corresponding appearances, was erased from existence following the collapse of the original Multiverse in the 1985–86 Crisis on Infinite Earths limited series. Even though versions of the character may have since appeared, this information does not apply to those versions.
- 3 Appearances of Sarah Primm (Earth-S)
- 1 Images featuring Sarah Primm (Earth-S)
- Quotations by or about Sarah Primm (Earth-S)
- Character Gallery: Sarah Primm (Earth-S)