Thad is a minor character from the 1985 animated series She-Ra: Princess of Power.
She-Ra: Princess of Power
When the two boys misplaced their father's ax, they were afraid to tell the truth and made up a story about it being taken by a man in a purple cloak. Bow immediately went off to catch this "thief" at the Green Thatch marketplace, but got captured himself by Mantenna.
It was She-Ra who uncovered the truth and rescued Bow. The ax was also returned to Mark, having been picked up by Twiggets Sprag and Sprocker. But the two boys were grounded because they had to learn more responsibility and stop lying.