WARNING! This article contains major SPOILERS for Apartment 7A!Uncovering the sinister events of the Bramford prior to Rosemarys terrifying experiences, Apartment 7A introduces a new character whose villain arc resembles the story of Guy Woodhouse in Rosemarys Baby. The ensemble of characters in Apartment 7A includes several returning figures from the 1968 horror classic Rosemarys Baby, including Terry Gionoffrio, the Castevets, Dr. Sapirstein, and, briefly, the Woodhouses. The prequel primarily focuses on the previously established cult members from the perspective of Rosemarys Babys Terry Gionoffrio, with Terry ultimately assuming Rosemary Woodhouses role from the original movie.

https://screenrant.com/rosemarys-baby-apartment-7a-guy-woodhouse-alan-marchand-replacement/