The antagonist here is played by Patrick Kerr, who frequently plays characters on other shows with a serious Star Trek obsession. In fact on the show Frasier (1993) its even stated his character has a restraining order from William Shatner.
Persistence of vision is the phenomenon of the eye where an afterimage is thought to persist for a small fraction of a second on the retina. The belief in persistence of vision is based on the mistaken belief that human perception of motion is the result of persistence of vision. This myth probably stems from the idea that the human eye is just like a camera, when in fact there is much more to it then that. Misinterpretation of this phenomenon over several centuries has led to the persistence of this myth. One explanation may be iconic memory; but this is a subject of many arguments among different branches of the medical profession.