Author's Note

A) Fluttershy
B) Twilight
C) Applejack
or
D) all of the Mane 6
Also, what name do you think the female Indominus should have?

Option D has taken the lead. However, there is no "official" agreement for the Indominus' name.

So far I've gotten:

Eris

Pearl

Razor

Afina

Sif

Eve

Philomena (which means "lover of power")

Willow

Keira

Yamato (Though honestly I'm iffy on this name because all characters I've seen named "Yamato" are males)

Do any of those sound nice? Please agree on a name soon, it's getting repetitive writing her as a "female Indominus."

Also, please comment on other dinosaur species, besides the one mentioned, you want to appear.

While Starlight may have been defeated, Season 5 is far from finished and I'm sure I can drum up some more adventures "between adventures".

Untamable

Okay, I thought it'd be nice to have some visual references, so here are the Dinosaurs that make up Spike's DNA now:

Tyrannosaurus Rex

Spinosaurus (as of a discovery in 2014)

Majungasaurus

Gigantosaurus

Rugops

Carnotaurus

Velociraptor

Indominus Rex

Just for fun, here's Fluttershy and a Gigantosaurus I found on Google

Spike lunged forward, sinking his teeth into a cow killing it instantly from his bite force and tore some flesh from it, swallowing it. While he could still eat gems, he almost never got any while in Starlight Glimmer's "custody". Maybe once in a while if a pony didn't resist her message, who inexplicably ended up needing to "leave town to visit family". On those days, the female Indominus Rex would make the kill, but make sure he ate from it. Much to his dismay; he mostly got meat nowadays, which unsettled him; despite having the DNA of multiple carnivores within him. However, hunger would override that unsettled feelings within him, and he'd be tearing into his prey with a vigor.

Thud.

Thud.

A white snout poked through the vegitation, a large head following it.

The female is here, and she must be hungry to arrive without letting me know of her presence. Spike thought. Stepping back, he watched as the Indominus stepped forward and started eating from his kill. Outside the corral, he could hear noises from other species that had been extinct; Pterodactyls, Spinosaurus, Triceratops, Compsognatus, Ankylosaurus, and Dilophasaurus. However, he and the female were the pride of Glimmer's experiments. Even behind walls, he could hear her gloating about her "weapons". How nopony would resist her.

"Are you sure that we'll be called out by the mean one?" The Indominus called out after swallowing a chunk of the cow. Her gaze was locked onto Spike's eyes, before glancing at the thick metal door.

"I've seen ponies and creatures like her...nine times out of ten if they have a tool they can use against others, they'll use it." Spike said, growling at the word "tool".

"The mean one will pay for her insolence!" Indominus roared out, as Spike glanced at some marks and few scars from tools used to keep them going in a direction or attempt to train them. Spike lowered himself to take another bite of his kill as the Indominus scratched at the walls of the corral, testing their structure.

"GRAAAAAARRRHH!" She roared out, a roar promising her captors disembowelment. Spike joined in with the roar, blood dripping from his maw as he flicked his tail against a tree. The cow remained mostly uneaten.

"Why aren't we finishing our kill?" She asked, glancing at the cow.

"Do you want to spoil your appetite if we are called out?" Spike asked with a menacing grin. The female understood what he was insinuating and grinned maliciously. Spike gave a growl as he saw Starlight Glimmer on the observation deck out of his reach, alone. However, there was a major difference.

She had an actual Cutie Mark instead of the grey Equal mark.

Spike snarled at her, as did the female. So...her own message was a lie. She didn't even follow her own rule of giving up her Cutie Mark. This was...interesting. Maybe he could use this to his advantage?

"So my weapons have developed nicely." She said with a smirk, only to jump back in shock as the female Indominus Rex grabbed a large rock in a forehand and chucked it at the observation deck, cracking the glass. "Easy girl."

"GRAAAAAAAAHHHHHHHSSSSHHHH" Spike roared out in a hiss-like fashion.

"Down boy" Starlight said with a smirk, casting a spell to disguise her Cutie Mark as an equal mark once more.

"GRRAAAAAAAAARRRRRRRR!" (I will tear you to pieces!) Spike roared out, slamming his tail into the ground in agitation. By only making sounds other wild animals would understand, Starlight Glimmer did not know that Spike could talk, or that the female Indominus was learning to talk from him.

"By the way Experiment, there are six ponies you might know in town...and I just might have you come face-to-face with them again." She said before turning around and walking out of the observation deck.

"You were right...we are going to be let out of the corral in her belief that she can control us." The female Indominus Rex snorted out, her red eyes calculating if there was a way she could climb up and reach the observation deck.

"There might be a slight change of plans though. How do you feel about making the Mean One lose everything before killing her?" Spike asked, glancing at the door of the enclosure. I'll see you again soon girls. He thought as he asked his question.

"That sounds like what she deserves. Explain." The female Indominus Rex said, snorting at the cracked glass in the observation deck.

As Spike was finishing up his explanation, an alarm blared out and the door of the enclosure started opening. As ponies started rushing to the door with shock poles to guide them, both Spike and the female rushed the door and slammed against it, their combined weight denting it outward and nearly knocking it down. However, it was enough to let them out.

"We've got to tell Starlight!" A pony said as they turned around and rushed down the path.

"It's a trap!" Twilight exclaimed as she and her friends were surrounded by Starlight Glimmer and her minions.

"Oh don't be so angry about it." Starlight said, "True Equality is better than you think, and I didn't hear too much complaining from your pet dragon when my scientists experimented with him."

At those words Twilight's eyes hardened like ice, glaring at Starlight as bolts of magic scattered across her horn. "You. Did. What?!"

"Oh yes. Dinosaur DNA to turn him into a new species. Indominus Rex; the Fierce King." She gloated.

"The predator we heard!" Fluttershy gasped out in realization.

"Starlight! Both Indominus have escaped!" A pony said, gasping for air from her long run.

"What?!" Starlight snapped before a loud Thud was heard and the vegetation shook.

"Well...it sounds like they are on the way here anyway. Perhaps they are trained after all!" She said, "It's time to show what our science of Equality can do!"

Thud.

Thud.

A large, purple scaled foot with black claws on it with the innermost toe raised with a deadly sickle-like claw on it stomped down by the mares, with a gigantic white scaled three toed foot with black claws slamming down next to it.

They gazed upon the large reptilian creatures as the purple one lowered himself. He let out a snort, blasting hot air across Rainbow Dash's face before inhaling their scent.

"S-Spike...." Twilight said, as she connected the color of his scales to who he was.

"They said I was a sign that true equality was the way to maintain harmony....but I know better. I'm a weapon!" Spike whispered quietly as Twilight traced a hoof across his snout.

The female Indominus Rex snorted, curious to why he wasn't going straight to the plan.

"Let's see how they fare when their weapon turns on them." Spike finished with a quiet growl.

"What are you doing?" Starlight Glimmer asked, walking up to him, "Aren't you hungry?"

Spike reared up and glanced down at Starlight Glimmer, inhaling before....

"GRRRAAAAHHHHHHHHHOOOAHRRRRRRR!" He roared out, lowering himself and slamming his head into Starlight Glimmer before holding her down with his left foot.

"SHOW THEM THE TRUTH!" Spike roared out, making Starlight's eyes nearly pop out of their socket as she realized that he could still talk.

"W...what do you mean?" She asked.

"DO NOT LIE! I SAW YOUR REAL CUTIE MARK! YOUR OWN MESSAGE IS A LIE!" Spike cried out, making the ponies she was leading look at each other in confusion.

"Do it, or I'll rip you in half." Spike said, lowering his sickle-like claw just over Starlight's side.

Letting out a shaky breath, Starlight let her disguise over her Cutie Mark fall, and her followers let out whispers before glancing at their equal marks before walking off, muttering under their breath. Spike stepped off of the defeated mare. "By the way" he said, much calmer and quieter this time, "I never said anything about the female."

With a roar, the female Indominus Rex charged and snapped at the mare. Starlight barley leaped out of the way before running out. Both Indominus Rex reared up and let out loud roars signifying their victory.

"So this is your friend?" Fluttershy asked, flying up and checking over the female, "How'd she get the scars?"

Spike snorted in the direction Starlight Glimmer ran off. "Three guesses." He spat out before suddenly shrinking to the size of a pony.

"You can control your size?" Twilight asked in shock, only to jump back as the female Indominus followed Spike's example and shrunk.

She glared at the ponies in front of her. She hadn't had any good experiences with ponies, and yet the male...Spike...seemed to trust them.

"Trust me. They get into crazy adventures regularly, yet they still come back. They are supposed to represent good aspects of life: Loyalty, Kindness, Honesty, Generosity, Laughter, and Magic." Spike growled out in their wild language.

"So they aren't like the Mean One?" She asked, snorting at them.

"Oh goodness no!" Fluttershy said, "You seem really tense. Maybe we should let you relax when we get back to Ponyville." The Pegasus began helping out by removing shedding scales, getting a sigh from the female Indominus.

"The others! We have to get the other species out!" Spike said, turning around and growing to full size, "They'll die if they can't hunt or graze!"

"Lead the way Spike." Twilight said, only to gasp in surprise as he nudged his nose at her stomach and pushed her onto his head.

"Anyone else want a ride?" Spike rumbled cheerfully as the other mares, besides Rainbow Dash who decided to fly, hopped onto the top of his head. Letting out a huff as he rose to his full height, Spike walked forward, sniffing the unfamiliar air as he moved. Behind him the female Indominus Rex walked forward while keeping her stare on the ponies around Spike; daring them to make one hostile move.

"Indominus Rex. Didn't Starlight know that Indominus also means Untamable?" Twilight asked.

"Most likely not. Otherwise she would have found another way to say Fierce King....or have gotten a warning that we can't be tamed. Not everyone lives in a library." Spike said as he headed up a large hill, stomping on and crushing a fallen log. Spike stopped to sniff the air, getting his bearing.

Stepping onto the correct trail, Spike let out a loud roar as he saw a metal enclosure with a twisted doorway.

"That's where she kept you, isn't it?" Twilight said as she watched Spike growl.

Huffing, Spike turned onto a nearby trail and after a short walk up a hill, he stopped to look over the other enclosures.

In one enclosure there was a large reptilian animal that looked like it walked on all fours with a large sail-like fin on it's back; walking on the knuckles of its front hands, before it reared up on its hind legs on raised it's crocodilian head and letting out a loud roar. In another other creatures had large fins on the back of their heads with three sharp horns on their head.

There were small green bipedal reptilian animals in their own enclosure, letting out chirps and growls. Another was shaped like a cage with reptilian birds with their beaks filled with sharp teeth.

In their own enclosure there were larger green bipedal reptilian creatures with fins pressed against their necks, hissing and growling as they sniffed the air. The last enclosure had four-legged creatures with clubs on their tail and thick armor-like scales covering their back.

"These are the dinosaurs Starlight had finished so far...and I'm sure she was finishing other species." Spike said, before inhaling and letting out a loud roar that got all of the creatures to look in their direction.

"Twilight...I have a feeling that things are just getting started; even if Starlight was exposed and chased off." Applejack said, an uneasy look on her face as the female Indominus sniffed at her.

In a building nearby, there was strange sounds echoing through the abandoned building. A cough-like bark echoed, followed by some hissing. A yellow eye with a cat-like pupil stared at a map of Equestria on the wall; an intelligent, calculating gleam in the eye. On each foot of the bipedal reptilian creature was a raised, sharp sickle-like claw.

There were Velociraptors on the loose, and they were hungry.