1x16 Shadow

While investigating an animalistic death in Chicago, Illinois, the brothers find a symbol of blood, which Dean later learns is connected to a Zoroastrian creature known as a daeva. They later run into Meg Masters, and Sam's suspicions of her lead him to discover that she was behind the murder. They confront her, but she reveals that it is all part of a trap set to capture their father. Sam and Dean manage to turn the daevae against her, and she is thrown out of a window several stories to the ground below. When they return to their motel room, they find their father waiting for them, but Meg returns and once again sends the daevae after them. Sam dispels the daevae with lighting flares long enough for them to escape. John then once again leaves his sons, feeling that they are vulnerable when all together.