Back in his TARDIS, the Doctor began to put the details together.
"Right, let's gather what we know about him. So far."
Ever nodded, although she barely knew anything about him at all.
Her head began to reel with effort as she started to recall the slimy tendrils and blank face. "Eel-like tentacle things-" "Tendrils," the Doctor corrected. Ever ignored him. "…coming from his back, which is probably what he uses to catch prey, hangs around trees, which probably means he's very good at hide and seek, white skin, so only a night thing I assume, and… no face, so extra creepiness. But he does do that thing with the fuzzy vision trees… maybe that's the weird 'corner of your eye' thing? I hate that!" she tried, wanting to be helpful. She closed her eyes in thought, trying to remember more details.
When she opened them again, she was surprised to be met by the Doctor's open jaw.
He swallowed, "V-very observant," he muttered, obviously impressed. "I almost calculated all that. Almost. Here's what I know:" He began to type a list of information, calling the creature 'alien X' and projecting the list using the TARDIS, making a virtual 3-D list.
Ever, unscathed by the technology, squinted at the name. "Yunno, if you're gonna keep referring to it as 'him,' we should give it a name. How about…. what is he, he's tall, he's black and white, he's… slender, so why not Slender Man?" The Doctor raised a disapproving eyebrow. She pouted. "What? It's better than, 'alien X!'" she mocked.
"Oi!"
Sighing, the Doctor closed the list. "I theorized that alien X is a different strain of the Carnegie Monster of the third eastern moon of Kasterbourus, in the galaxy Sheprenia. The Carnegie Monster, however, is a generally harmless, faceless creature that stalks those that pass its territory, but it feeds by absorbing the second Sun of Kasterbourus's energy. The third moon, known as Hesterbrus, is a cavernous isotonic water wasteland, cold and desolate, but bathed in exotonic energy and covered in thick interdimensional forests. The creature now inhabiting Earth must have somehow created a tear in the fabric of space, leading a portal of sorts here-"
"How could it create the portal?" interrupted Ever thoughtfully.
The Doctor blinked, surprised she had been following along with his babbled logic.
"Er, probably because a sun spot caused a spike in exotonic energy, raising the overall energy of the moon, which expelled it into the fabric of space and tore a hole." he explained, as Ever listened carefully. "But it wasn't meant to come like this. The Carnegie Monster is a pleasant thing, really, even is capable of emotions such as love. Something must have gone wrong when it was sucked in. I hope it's reversible…" He trailed off again sadly.
She nodded in acknowledgement. "Right. So, in order to beat this guy, we have to… reverse the transdimensional side effects and reunite him with his home planet?" she said questioningly, looking to the Doctor for approval.
The Doctor smiled. "Yes, Ever, we're gonna send him back." He was relieved she hadn't turned to murder, being a human. He then criticized himself for thinking she was that kind of person, and immediately felt a pang of guilt.
Ever smiled back. "How do you propose we do so?" she wondered, mostly to herself. Her wobbly eyes were concentrated on the list, as best as she could, and even though she was a bit derpy, she held a genius of her own.
The Doctor scrutinized the list, his intelligent brown eyes sparkling with genius and thought, and smiled. "I think I have a plan."