Answer
"F/X" stands out as the movie where actor Brian Dennehy portrays a special effects expert. Dennehy's character plays a crucial role in the film's plot, utilizing his expertise to create realistic visual illusions for a major motion picture production. Throughout the movie, Dennehy's character grapples with ethical dilemmas as his creations blur the lines between reality and artifice, leading to unexpected consequences and a gripping narrative.