Bio-molecular transmogrifier

The bio-molecular transmogrifier is a machine created by Mister Mind that can transform people into monsters.

Scooby-Doo! Team-Up
He planned to use Shaggy Rogers and Velma Dinkley as test subjects, but they were able to break free, due to the wizard Shazam turning their catchphrases into magic words, allowing them to transform into superpowered versions of themselves called Shaggy Marvel and Velma Marvel.

Appearances

 * Scooby-Doo! Team-Up
 * #16.