"Upstanding Yuck" is the first segment of the forty-eighth episode of Yin Yang Yo! It premiered on August 4, 2008 alongside "A Walk in the Woods", and is the first segment of the twenty-second episode in season two.
While Yin and Yang make a toilet paper run for Master Yo, they come face-to-face with Yuck. But Yuck has changed. Both Yin and Yang don't believe that Yuck is now a good guy, so they follow Yuck to see what his new evil plan is. Yuck goes to the city, donates all his savings to a Redneckistan care program, helps President Muffin's kitten, changes a flat tire, and cleans Master Yo's toe jam. But Yin and Yang still don't believe that Yuck has truly changed.