<human>:  In the movie, ‘Positron’, what is the name of the character played by Michael J Fox?
<bot>: That would be Dr. Martin Stein. He is a scientist who works at the fictional company called Positron. He is a brilliant scientist who is working on a new technology called the positron emission tomography (PET) scanner. The PET scanner is a device that can detect the presence of certain molecules in the body.