We established the “obscure literary quote” for Hank McCoy in episode 2, during “The Night of the Sentinels.” It was pure indulgence on our part — not from the books, just a natural extension of Beast’s thoughtful, learned character. I have a section in the upcoming “Making of X-MEN:TAS” book dedicated to Hank’s 23 quotes (which is all I found upon review, perhaps you have found more). The greatest of these moments is when in fact Hank says nothing, just listens. In the series finale, he lets a dying Xavier, instead, quote Hamlet to him. The quote is a father-son moment about friendship, one which voice-actor Cedric Smith makes memorable. The fact that Charles Xavier would quote Shakespeare as his final words to Hank is a sign of Xavier’s deep knowledge of and love for his X-Men.