Mr. Dark is a fictional character from the novel Something Wicked This Way Comes by Ray Bradbury. He is portrayed as a mysterious and sinister figure who runs a traveling carnival that arrives in a small town. Mr. Dark has the ability to manipulate people's desires and fears, often using them to lure individuals into his dark schemes. In the story, Mr. Dark embodies the theme of temptation and the struggle between good and evil. He represents the darker aspects of human nature, preying on the vulnerabilities of others. His character serves as a catalyst for the main characters, Will Halloway and Jim Nightshade, as they confront their own fears and ultimately seek to overcome his malevolent influence.