a film or television programme that is fictional but includes many factual events or details
semidocumentary in American English
(ˌsɛmɪˌdɑkjuˈmɛntəri)
noun
a film in which the technical style of a documentary is applied to a fictional subject, or, sometimes, to the dramatization of the story of a real person or situation, so as to add authenticity and realism