 He is the co-creator of the science-based teen superhero SPECTRA.Spectra, the main character, is also the mascot for Laserfest 2010, a yearlong celebration of the 50th anniversary of the laser.In 2011, Johnson worked with writer Rebecca Thompson and published their third comic book, "Spectra, The Original Laserfest" "Superhero," for the PhysicsCentral.com web site.