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

Yin and Yang tell Yo that he is old, and Yo makes them pick up his medication. Yo throws a party to look cool, but Yin and Yang make Yo's old enemy, Kraggler, mad. Kraggler turns everyone, except Yin and Yang, into old people.

Yang fakes being a Woo Foo Warrior to impress a girl. To prove his skills, he has to take out a huge steel beetle.

Yin and Yang get into a fight while cleaning their room, and when Yin costs Yang the world record at a video game, he refuses to shower until one of them cracks and apologizes. But Yang is soon encouraged to clean himself up when his odor attracts the amorous advances of Malodia the Elephant, Princess of the Stink Aardvarks.

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.

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

Yin falls in love with a person named Brett who actually turns out to be Yuck.

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

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.

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.

Yin meets a hamster who loves to clean while she is out buying cleaning supplies. The hamster reveals himself to be Fastidious, and asks the Woo Foo students to help him defeat some of the spirits who have been making a mess. However, there is something sinister about Fastidious.

Carl wants to use his mother's destructive jewelry for his nefarious purposes (especially since she never wears them) but his mother, Edna, won't let him. Meanwhile, Yang pulls a practical joke on Master Yo by posting his bio on a website for dating service for old people. Master Yo's blind date turns out to be Edna. Can Yin and Yang break up this relationship that's not meant to be before Carl can take advantage of his mother's absence?

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

Yang is really interested in a girl named Lina, who is Yin's really good friend. The trouble is, Yang's behavior turns Lina off. So Master Yo suggests that Yang should try to be more like Yin in order to make Lina like him.

Yin and Yang host an awards show for evil Brother Herman.

A new master is in charge.

Saranoia returns.

Coop teams up with Yin and Yang to win back an ancient Woo Foo artifact.

Herman and Carl want to give their mom a pair of rabbit's feet for luck.

Yang finally makes some guy friends, but they're not who they say they are.

Yin and Yang wonder if Master Yo is really evil.

Yin and Yang are put on trial.

Yin and Yang follow Yuck to a terrifying place... inside Master Yo.

Yang uses an ancient tool to end Yin's constant pursuit of popularity.

Information on Yin and Yang is leaked to the Night Master and the twins try to find the culprit.

The Night Master plots to kidnap Master Yo so he can plunge the world into darkness and be free.

Coop's mom is throwing a "welcome back/thanks for saving the world all by yourself" party, and Yin and Yang are the only ones not invited. Meanwhile, three flunkies join together and try to get into The Night Master's fortress. However, they need the spare key, which the Night Master gave to Coop!

Yin takes credit for saving the mayor, without acknowledging Yang's help.

Yang's brain becomes controlled by a villain known as Mastermind.

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.

Carl forms a league of evil with three other villains when they all rent an apartment together.

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.

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

Mr. Pondscum realizes he isn't a goldfish but a polliwog.

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

Yang loses his emotions after he is zapped by Fred.

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Carl traps Yin and Yang in a sitcom with a magic remote.

Carl attempts to blot out the rays of the sun.

The Chung Pow Kitties are desperately trying to claim the Licking Stick in the Woo Foo Weapon armory as their very own.

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

Yang casts a spell that makes him disappear and unable to be heard.

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

Yin and Yang play a cursed video game, which requires them to keep dancing or die.

Yin and Yang's former enemy Yuck returns and claims to be a reformed rabbit.

Yang gets a pet but it runs away after he neglects it.

Zarnot creates a robot girlfriend for himself.

Yang seeks out a vigilante named Possum Panda, but he discovers solo crime fighting isn't all it's made out to be.

Yang resorts to talking to a dummy after Master Yo leaves town, which infuriates Zarnot.

Eradicus creates a monster that gains power by consuming everyone's fears, and Yin and Yang try to destroy it.

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

Yin and Yang team up with different partners to fight a common enemy.

Master Yo goes to extreme lengths to get Yin and Yang to take fighting seriously.

Carl tries to make Yang his evil minion.

Master Yo's recliner is discovered to be inhabited

Yin and Yang's dirty-laundry pile turns into a monster and escapes into town.

Yin and Yang throw a party, but Eradicus plans to crash it so he can destroy them.

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.