Yin reluctantly goes on a date with Coop, and she falls under his evil spell.

Yang hurts Yin's feelings when he starts training under Ultimoose.

Yo tells Yin to go to the valley of the two-ni-corns and find a rainbow mane The Gnu to fix her toy. Meanwhile, Yang is taken over by Ultimoose.

Yin uses the misfortune cookies on Yang to take away his good luck.

Badfoot tries to steal a powerful artifact from Master Yo.

Carl attempts to blot out the rays of the sun.

Yang loses his emotions after he is zapped by Fred.

Yang won a doll at the county fair for Yin, but the doll is actually Zarnot.

Yin, Yang and some of their friends accept a free vacation to a mysterious island, not knowing that it's a trap set by Smoke.

Kraggler uses the cronalogicum to trade ages with Yin and Yang so he can become young again.

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.

Yang takes a job at an amusement park that turns out to be anything but fun.

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

Master Yo gives his young protégés a test, which involves having them watch a seemingly harmless rock named Hershel.

Carl, the Evil Cockroach wizard, gives Yin and Yang a new TV with only one remote. Yin and Yang fight over the remote, giving Carl a chance to destroy them.

Yin and Yang use Zarnot to boost their popularity by lying. When Zarnot becomes huge, they must prove that they are telling the truth.

Yin's Woo Foo Aura gets out of control, trying to save the environment and escapes Yin's body, destroying the town.

Yin hosts her first slumber party but she drives everyone crazy with her strict schedule.

Yang is thrilled that the CPK (Chung Pow Kitties; a pastiche of Hello Kitty and Powerpuff Girls), a rock band made of cats with mad ninja skills in town. Not only that, but they also appear on Broadway and are looking for a new member. Having a sharp sword is a requirement. Yang's bamboo sword isn't sharp enough, but Master Yo refuses to give Yang a new sword. Yang plots to steal weapons from the Forbidden Armory to try to make the cut.

Yin and Yang are fishing when a group of female pirates appear. They act really nice towards Yin, but not so much towards Yang. Are these pirates all they appear to be, or is there something else about them?

Yin and Yang prepare to go on vacation. Coop returns and tried to warn them of The Night Master's energy escaping, but they ignore him until it's too late.

Ultimoose and Yang search for an amulet that will give them all of the Night Master's powers.

Yin comes down with a case of the Woo Foo Flu, an illness that causes her to bend reality whenever she sneezes. Master Yo orders Yang to take care of her while Master Yo concocts an antidote for the Woo Foo Flu. However, Yin later gets captured by Carl - who intends to exploit her illness so it can help him take over the world - and Yang may have to get himself sick to save Yin.

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The Night Master rebuilds his armies that were frozen years ago by Master Yo. Little do they know, Yin and Yang are involved in his plan.