OK Peeps this is gonna be a little bit tricky because as anyone who knows anything about C.S. Lewis would know That Hideous Strength is a Christian story here, Yuki's Sensei doesn't say he converted to Christianity or advise anyone else to convert (He seems to imply as long as they aren't evil Mutant Animals are doing the Lord's Work regardless of what they believe as said by Aslan in The Last Battle to the Emeth the Calormene "all the service thou hast done to Tash, I account as service done to me" and here I am confirming he is The Ancient One's colleague as a previous acolyte of the Ninja Tribunal

Yuji's POV

Awakened by the sound of my screaming, the Turtles and Splinter ran out of their rooms even Mikey who had recovered even though his arm was still in a sling.

"Mikey!" I called out to the Turtles "Get Mikey away from here before he…HE'S ALREADY HERE!"

The Skull Headed Crow was already in the lair, for a moment he hovered in the air as he spoke "So soon I've found you Flesh of my Flesh…My mission and heart's delight…Prepare yourself, Desolation is coming!"

And with that the bird dove down toward Mikey, his brother drew their weapons, but it was to no avail, no mortal could have stopped that bird…He knocked Mikey down as he struck and vanished into his chest.

"Mikey!" Don shouted as he rushed over to his brother. "We've got to save him!"

"There is nothing we can do now…" My Sensei said loud and clear so everyone could hear "Your brother contains a Demon inside him, this spirit is Trickster…A bringer of death…It is up to Michelangelo's will, he must not listen to the demon as it tries to trick him."

"But…Why…" Don asked with pleading eyes "…Why did it attack him?"

"Because Michelangelo's blood was spilled in the place touched by the Demons…That was what made him vulnerable and selected for Desolation's test…"

Feeling despairing they could do nothing for their brother, and fearing for Mikey's ability to pass a demon's test, Leo and Raph picked up Mikey and carried him downstairs to place him on the sofa bed.

That was when April and Casey arrived shocked and horrified by seeing Mikey out cold!

"I called them a few minutes ago and asked them to come here…" Papa said to Splinter and the Turtles "…And it seems it was a good thing I did for Desolation's appearance is a sign what I feared to be true is…"

"What is that?" Splinter asked

"Demonic influence on the Scientists." Papa said

"You mean…Like the Tengu Shredder?" Leo asked

"Even worse…" Papa said with a shake of his head "Tengu Shredder was small potatoes compared to this…No I'm talking about the Father of all Demons…The Original Evil One…"

April hesitated for a moment then said still clearly not wanting to say it, because it offended her rational scientist's mind

"You mean…The Devil? Satan?"

Papa sighed and said "Yes."

Don groaned, clutching his head said "I need to sit down…" As he sat down right on the floor as Leo and Raph placed Mikey on the sofa bed.

I realized Don's skepticism was odd…He had faced demons before…So why was the original demon of Christianity so hard to believe?

"I know this all seems unbelievable…" Papa said "…But this is something I have been researching for a long time…I have learned that you Mutant Animals are connected to this…" He sighed again "…Many years ago…During World War Two…I met a Mutant Animal…He was a Rat like Splinter…But he was larger…And bent and twisted but he was as intelligent as any of you…But he was not born of Utrom Ooze but of a human laboratory experiment, I was not compassionate to him and so he ended up dying a horrible death…I felt so much guilt after that that I vowed I would never let it happen again…"

I was frozen for a moment, I had never heard that story before, so that was why Papa adopted me! Everyone's face were both amazed but also somewhat calmed by this story…None of them had ever any inkling there had been any intelligent mutants before themselves! I saw Mikey lying perfectly still on the bed and my heart went out to him and began to hobble over to him.

"I knew one day I would meet a Mutant Animal again, but until I encountered Yuki my quest was to figure out how…And why were the Animals becoming intelligent and speaking? I knew it wasn't just the will of the scientists experimenting on them there had to be another reason for this…" I was almost at the bed when Papa caught me "I see you Yuki!" He said "Do not touch Michelangelo! His family can touch him but not you! You were not mutated the same way as they were…You were Mutated by Earth Magic, and so the Demons are also heavily interested if you were to touch Michelangelo you risk also suffering his fate!"

I saw his point and instead went over to Don and sat down beside him on the floor, he seemed to appreciate the company and that I did it without having to be asked.

"I am a colleague of the one you know as The Ancient One…" Papa said "…I was one of his fellow Acolytes but my quest to find why the Animals were beginning to speak led me to find Christianity had the best answer to the questions…And that put strains on my relationships with my fellow Acolytes and the Ninja Tribunal…"

Jonathan's POV

Jonathan braced himself by holding onto the back of the armchair as he heard all this…The appearance of the Skull-Headed Crow nearly gave him a heart attack, he feared that bird was coming for him! But as he heard more and more…He realized the more it was all beginning to make sense….He remembered being taken to Church against his will as a child, he knew he had been baptized…Thinking back to the moment with those crows pecking at the window and the fear he felt…Was it the Baptism that saved him, that alerted him to the presence of demons? And feeling him with a feeling of fear prompting him to leave while he still could?

That's all I can think of for this chapter, not much else to say but just making the religious theme clear but as much as an actual C.S. Lewis book as I don't know what I am and I'm just being honest