13 Stars You Didn't Know Were on American Horror Story

American Horror Story has become famous for its impressive ensemble casts, which have featured A-listers such as Jessica Lange, Kathy Bates, Lady Gaga and now Joan Collins, who will appear in the upcoming Murder House-Coven crossover season Apocalypse.

But while we all know creator Ryan Murphy's main stable of American Horror Story stars -- including Sarah Paulson, Evan Peters, Lily Rabe, Denis O'Hare and Frances Conroy -- there are so many other famous faces who have graced us with their presence that go largely unrecognized or even unremembered!

To that end, we went through the archives and dug up all the biggest guest stars from American Horror Story's first seven seasons that you've probably already forgotten about. Because in a show like American Horror Story, it's always best to refresh yourself with the past because you never know who will resurface again in the future.

American Horror Story: Apocalypse premieres Wednesday, Sept. 12 at 10/9c on FX.

Other Links From TVGuide.com American Horror Story: Murder HouseAmerican Horror Story: HotelAmerican Horror Story: Freak Show American Horror Story: RoanokeAmerican Horror Story: CultAmerican Horror Story: CovenAmerican Horror Story: AsylumAmerican Horror Story: Apocalypse