Great Master Viper is the father of Viper, husband to Viper's mother, and the leader of the Viper Clan. He has appeared in Secrets of the Furious Five and Secrets of the Scroll. According to Po, Great Master Viper is the greatest known leader and warrior of the Viper Clan, as well as the sole protector of their home village. He is highly dependent on his "Poison Fang Technique", with which he used his venomous fangs to fell his enemies. Given that his venom was deadly enough to fell fifteen gorilla warriors and a mid-sized crocodile, he quickly built up his legacy and became greatly feared by his enemies.