Smallville - Season 10 Episode 18

Clark gets an inverse make-over from Lois, in order to become a gray mouse when the Blur goes public. Just then, a flashy media-hungry new superhero emerges: Booster Gold, who systematically steals the show. Clark discovers Booster came from the future with a Legionnaire's ring, probably stolen. Generally bullied, shy schoolboy Jaime Reyes is inadvertently infected with the alien scarab which Booster was hired to retrieve for industrialist Ted Kord, hence transformed into the Blue Beetle, an uncontrollable monster. Clark could just expose Booster as a fake coward, but chooses to educate him in superhero ethics.