"Woo Foo Flu" is the 5th episode (part one) of Yin Yang Yo!
Yin and Yang fighting Carl when sneezes and turns a tree branch to a snake. Then fighting Rodger Sr. Yin sneezing and turns him into a puppygirf. Then after getting a bag with a dollar sing on it Yin sneezes and turns it into an armilldo. Back at the Yo tell her she has woofoo flu. That every time she sneezes she do something. She could tear reality itself. Yo puts Yang in charge of taking care of Yin so Yin takes advantage of it.Yang get sick of it and Carl dressed as a nures offers to take care of her. Carl kiddnaped her so she will change reality and he will rule it. Yo sends Yang after Carl to get Yin. Yin sneeze and puts everyone to realityand Carl is incharge. So Yang takes Yin's snotty hankey and comes down woofoo flu and then Yin and Yang change reality back to normal and Yo takes care of the sneezes all they have to do is get over the sick part while Yo takes care of them.
- This episode features Carl as the main antagonist
- This episode had an ending that was altered through the series. The first involved Yo simply sneezing at the screen, with snot covering it. The second causes him to sneeze and transform the dojo into basically hell.
- When Yin and Yang are sneezing their way through different realities, themselves and Carl can briefly be seen as humans!
- We see Carl in the big muscular appearence that he has in the opening credits.