In the film Kung Fu Panda 2 , Shen plans to destroy kung fu tradition with his cannon that fires weaponized fireworks .
Shifu receives word that Shen has returned to Gongmen City and killed Thundering Rhino , the leader of the kung fu council protecting the City , and is plotting to destroy kung fu tradition and conquer China with his newly developed weapon , a cannon that fires weaponized fireworks .
Kung Fu Panda 2