Invisible Archie

S1 E4: In an effort to catch both Veronica and Betty's attention, Reggie attempts to steal some of Dilton's physique enhancing solution. When Archie tries to stop him, they both get accidentally splashed with the liquid. Instead of their physiques becoming enhanced, they turn invisible! While Reggie uses his invisibility to play practical jokes on people, Archie must get Dilton to create an antidote to reverse the effects.