The Doctor then tells Drathro that a Black Light explosion could destroy the galaxy or even the entire universe, but Drathro becomes determined to allow the explosion, convinced that his demise will be a unique event.
The Doctor then tells Drathro that a Black Light explosion could in fact destroy the galaxy or even the entire universe. Unfortunately Drathro has developed a case of hubris over the years, and becomes determined to allow the explosion to happen, convinced that his demise will be a unique event.