The Ethicator explained.

The Ethicator is an add-on device for the Duplicator which allows the user to control the moral characteristics of the duplicate. Calvin only used this add-on once, to make a duplicate of his good side to do his dirty work, including going to school.

Despite its apparent usefulness, the Ethicator was a failure, evidenced when the duplicate began writing embarassing love letters to Susie Derkins. Calvin had unintentionally integrated a Moral Compromise Spectral Release Phantasmatron into the Ethicator, meaning that if a "good" duplicate had an evil thought, it would vanish to prevent defeating his purpose. Presumably, it worked the opposite way for a "bad" duplicate.

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.