Leo (Adam Levine)
For his TV acting debut, the Maroon 5 singer perhaps the most anxiously awaited newcomer of season 2 will play one half of a newlywed couple visiting modern-day Briarcliff. If you thought Rubber Man was a formidable foe, wait until you meet the Big Bad whose attention Leo draws. Let's just say, this adversary effectively kills the honeymoon romance. And, since this is American Horror Story, it's safe to guess that's only the start.