Simplify the following text for a Grade 9 native English-speaking person.
Original: In the series , FBI agents Fox Mulder ( David Duchovny ) and Dana Scully ( Gillian Anderson ) are the investigators of X-Files : marginalized , unsolved cases involving paranormal phenomena .
Simplified: The series is about two FBI agents , Dana Scully ( Gillian Anderson ) and Fox Mulder ( David Duchovny ) .