Spirit of the Mask

S1 E17: The team finds an ancient mask of a tribal deity at the Yeveh Burial Grounds in West Africa and put it in a box at the request of their client, Pere Martin. The team gets away from attackers and returns the mask, which has stored up hundreds of years of pain and fear and seems to have a strange influence on MacKenzie. Robbers attack and take the mask in its box while Mac becomes obsessed about finding it.