Claims that all seasons of "American Horror Story" are intertwined with one another are no longer a theory.

Series' co-creator Ryan Murphy confirmed the speculations that all installments of the hit FX anthology series are connected when he was recently asked by Entertainment Weekly about Lily Rabe's return to the show.

"I don't want to say much about [Rabe's comeback] but obviously she's playing Sister Mary Eunice," Murphy said. "The interesting thing about doing a show like this is every season is incredibly its own story and its own beginning, middle and end. Its own journey. But we have always from the very beginning in the intertwining mythologies and how things connect."