Season 9 Episode 21 Sleeping Monster Grey's Anatomy Season 9 Episode 21 "Sleeping Monster" Spoilers 04.08.2013. @ 02:35 ShaneOlgaOcampo Check out the spoilers abound on Grey's Anatomy season 9 episode 21 titled "Sleeping Monster". After several of Bailey's patients die, she becomes the focus of a CDC investigation. Cristina teases Alex about his feelings for Jo. Owen continues to take care of Ethan while his parents remain in the hospital.