Phenomena is a 1985 English-language Horror Mystery film directed by Dario Argento and produced by Dario Argento under the banner of DAC Film. Jennifer Corvino, the daughter of a famous actor, has had trouble with sleepwalking for some time. Her doctor said that it can develop a split personality. She discovers her alternate personality when she stays at a boarding school that was once the home a Richard Wagner. But someone has been killing the students, and it relates only indirectly to the criminal sanitorium nearby. So it's up to the two greatest detectives the world has ever known, or should I say, unknown Written by Scott Hutchins. Phenomena features Jennifer Connelly in the title role along with an ensemble cast including Daria Nicolodi, Dalila Di Lazzaro, Donald Pleasence, Patrick Bauchau, Fiore Argento and Federica Mastroianni. The screenplay is written by Franco Ferrini and Dario Argento. Cinematography was done by Romano Albani and editing by Franco Fraticelli. The motion picture has a running time of 116 minutes. It was released on 31st January 1985. Distribution rights for the film were acquired by Titanus.