Yin Yang Yo - Upstanding Yuck

While Yin and Yang were making a toilet paper run for Master Yo, they were face-to-face by Yuck. But this time Yuck have change. Both Yin and Yang don&believe that Yuck have really change from bad to good. So while they follow Yuck to see what his new evil plan is, Yuck went to the city. Donate all his savings to a Redneckistan care program, help President Muffin&kitten, change a flat tire, and clean Master Yo&toejam. Yin and Yang still don&believe that Yuck have truly change. Will they found out what Yuck&plan is or will they following will bring something evil back?