As the Kung Fu masters regrouped and discussed their options, they began to suspect that there was a traitor among them. They couldn't be sure who it was, but they knew that someone was feeding information to the Shadow Warriors.
Po and the Furious Five were tasked with finding the traitor and bringing them to justice. They interrogated all of the suspects, using their Kung Fu skills to extract the truth. Eventually, they discovered that one of their closest friends had been working with the Shadow Warriors all along.
Po was devastated by the betrayal. He had trusted this friend with his life, and he couldn't believe that they would betray him and the rest of the Kung Fu masters. The traitor was immediately arrested and placed in a secure location.