The Thunderman is the most powerful slayer in existence, and the only person capable of wielding the Thunderstone as a weapon. After a successful search to find the Thunderstone, Mr. Holmes returned to Parkers Canyon believing his son Kayden to be the rightful wielder of the artifacts power. However, he discovers that he himself is the Thunderman and uses the Thunderstone to break the Sun Spell on Parkers Canyon. He intends to establish a new status quo where Slayers run PC, but his plan is ruined when the supernaturals come together to fight against his slayers. Ultimately, Kayden kills his father to save the town.