mockumentary
From Longman Dictionary of Contemporary Englishmockumentarymock‧u‧men‧ta‧ry /ˌmɒkjʊˈmentəri $ ˌmɑːk-/ noun (plural mockumentaries) [countable] a funny film or television programme that pretends to show real people and events, although in fact they are not real a mockumentary about a fictional rock band