This has to be a great plus for the writing team and the voice actors playing both The Flash and Lex Luthor. They really showed their versatility as talent, and performed beyond what I consider quality entertainment.
One of the best lines in this episode comes from the Flash (inside the body of Lex Luthor). In the washroom, Lex (Flash) is about to leave and Dr. Polaris asks him, "You gonna wash your hands?" To which Lex replies, "No....'cause I'm evil." Beautiful.