"A little background: Scientist Jemma Simmons (Elizabeth Henstridge) was trapped somewhere -- an unknown location on Earth or another dimension, or just a different locale that might not be on Earth (that would be my guess if you follow the Marvel comics). Once there, she was terrorized by something, a shape-shifting being/creature called Lash. Due to the persistence of her friend and fellow genius-level scientist Leo Fitz (Iain De Caestecker), she escaped. They like each other, but it's complicated."
It's great when people write about something they didn't even watch...