Applejack was the first to attack Ultron. She tried to punch it in the face, but Ultron caught her fist in the air with one hand. Then, with its other hand, it grabbed Applejack by her neck, lifted her up, and threw her across the room towards a bunch of computers. Rarity then threw one of her diamond shields but Ultron just swatted it aside and quickly fired its stun laser, paralyzing her. Then, Pinkie began throwing explosive sprinkles but none of them made a dent in Ultron's armor. Rainbow then tried to attack it with her super speed but Ultron moved out of the way just before she could hit it. It then grabbed Rainbow by her ankle, used her like a baseball bat to strike Pinkie, and then threw her towards Applejack.
"I have carefully studied your previous battles and calculated every possible statistic regarding your abilities. I know virtually everything about you. In fact, I know you better than you know yourselves."
Applejack quickly recovered.
"You ain't seen nothin' yet, partner."
She tried to strike Ultron with a jump punch, but it uppercutted her in the jaw.
"This struggle is pointless. I have evolved to a point where none of your powers can affect me. I can no longer be restricted by ULTRON-5's programming. Now, I am the highly advanced version of ULTRON-5. Now, I am ULTRON-6, the world's ideal peace-keeper and your destroyer."
Rainbow also recovered.
"Whatever you are, I'm pulling your plug once and for all!"
She tried to attack with her speed again but Ultron simply dodged the attack and kicked her to a nearby wall. It then slammed her head to the floor and began charging its liquid nitrogen cannon to maximum level, which would cause instant death by frostbite. Just as it was about to release the liquid nitrogen, however, Twilight used her magic to throw it to the ceiling and drop it down. She then pulled Rainbow away.
"I'm so sorry Ultron, but you've given me no other choice. Begin shutdown sequence! Passcode, Orion!"
"Shutdown code... Rejected."
"What? How?"
She suddenly got hit by a couple of lasers emitted from Ultron's eyes.
"As I stated before, I have evolved beyond your programming restrictions, beyond ULTRON-5. I am now designated as ULTRON-6 and you no longer carry any significance to me."
It started pressing its foot against Twilight's ribcage, making her cough violently. Spike tried to save her by trying to bite Ultron's leg, but Ultron promptly grabbed him and threw him to the ceiling. As she was struggling to breathe, Twilight finally realized something.
"You're not my Ultron anymore, are you?."
"Negative."
She began tearing up for a few seconds before wiping them away and spoke with a furious tone.
"Then, I don't have to hold back!"
With her magic, she lifted Ultron up and with one powerful strike, she tore apart its head, limbs, and body. Finally, she removed its power supply from the inside of its chest and crushed it. Ultron's eyes quickly faded to black. Afterwards, her friends managed to recover, and helped her and Spike get back on their feet. However, she quickly pulled herself away from them and sat on her bed in sadness.
"Are ya alright, sugarcube?"
"No, not at all. My greatest invention turned into a monster and nearly destroyed you. I should've never built it in the first place. This is all my fault!"
"No, it's not, darling. Your creation became a monster on its own. You have nothing to be sorry for."
"But I'm the one who built it! I'm the one one who designed its AI to learn and evolve further!"
"Yeah, but there's no way you could've seen this coming."
"But I should have seen it. You were right, Rainbow. I should've considered the robocalypse risk from the start."
"Actually, I wasn't very serious about the whole robocalypse warning. I just saw it in TV one time and it looked a little creepy. Aside from that, I had complete faith in Ultron. We all did. Right, girls?"
They all nodded in agreement.
"So, this was kinda our fault too."
"We were all so distracted by Ultron's benefits that we completely got carried away."
"And I thought the only thing that could distract me was cake frosting!"
Rainbow sat beside Twilight and put her hand on Twilight's shoulder.
"We're all sharing the blame, Twi. You're not alone in this."
The rest of the girls also sat beside her and put their hands on her shoulders, while Spike curled up on her lap. Twilight let out a sigh and finally smiled.
"You're right, guys. This wasn't just my fault. The blame lies in all of us and it's our responsibility to make it right. Ultron may be offline but there are still a few things here and a few other things in these computers that can allow someone else to bring it back. So, what do you say? Clean up our mess together?"
They all agreed to do so.
"Then, let's start by picking up Ultron's remains."
However, as they started doing that, the eyes on Ultron's severed head secretly glowed red for a few seconds.
"Upload complete."
Then, they immediately faded to black.