Melodia the Aardvark Princess returns to claim Yang until Fastidous makes Yin mad with the Stink Aardvarks.

Yin and Yang learn self-control at an institute, but its founder, Ultimoose, may have more sinister plans in store.

Master Yo is sick of Yin and Yang disrespecting him. Yin and Yang are sick of Master Yo treating them like babies. When young Kraggler switches ages with Yo (part of a diabolical plan), Yin and Yang are forced to babysit the three-year-old Yo, and he reveals how powerful (and bratty) he was as a child.

Yin and Yang attempt to defeat a half-human, half-bull monster.

Carl magically switches brains with Master Yo in an attempt to destroy the Woo Fo warriors.

When Yang separates himself from Yin and Master Yo, he saves a robot, and they start to act like brothers. But Yin is feeling suspicious and jealous and discovers the robot is actually a spy made by Zarnot sent to destroy Yang.

Yin and Yang are magically stuck together by Mastermind so they will learn to cooperate with each other.

Carl disguises himself as a normal kid to stop Eradicus from carrying out an evil plan that would make everyone bad.

Yin and Yang are tricked into entering a dangerous car race.

Carl tries to make Yang his evil minion.

Master Yo's recliner is discovered to be inhabited

Leena meets Jason Earles and Mitchel Musso when she lands in Earles' backyard in Hollywood, where the two friends argue over who has the best hair.

Eradicus tries to divide the Woo Foo army in order to conquer it. He then takes a vacation at a spa where Master Yo is staying, and the two enemies attempt to get along for the duration of their stays.

Yin and Yang search for their parents after Yin is drained of her aura and only a transfusion from a parent will save her.