C-3PO & R2-D2 in MLP: The Movie

Finale (Chapter 5)

As the Mane 5 thought all hope was lost, denied help from the Queen of the Seaponies/Hippogriffs and the capture of Princess Twilight Sparkle. New friends they made along their harsh journey came to their aid.

Capper the con artist, Captain Celaeno and her pirate crew, Princess Skystar of the hippogriffs, and the "R-Series astromech droid" R2-D2.

With unexpected help from Queen Novo, the band of heroes with their hippogriff army, they take the fight to the Storm King to liberate Canterlot and end his reign once and for all...
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For some time now, the team have been traveling in Queen Novo's skiff accompanied by the army of hippogriffs heading for Canterlot. The tiring journey and hardships the ponies faced had finally come to an end.

"How are things looking, Celaeno?" Capper asks the parrot captain.

Celaeno stood at the bow of the skiff and was one of the pirates who kept lookout.

"Things seem to be...foggy. We are proceeding with caution." Celaeno was not kidding, with the fog it made it hard to see anything.

"Ah just can't believe it, our journey actually paid off." Applejack relieves.

"I feel the same way as you do, darling." Rarity agreed.

"Yay." Simply cheers Fluttershy.

The only astromech droid in the group, R2-D2, also felt great that they were about to launch one of the greatest sieges in the land's history. But he wasn't completely happy as a thought lingered on his mind: His friend C-3PO.

Unlike R2-D2, C-3PO was very much still with the Storm King. He was concerned with his friend's emotional state. C-3PO thought R2-D2 was destroyed on Celaeno's ship, he must have been having his thoughts of regret and despair. R2-D2 thought as he gazed into the fog of nothingness.

The little droid turned out to be right, that was on C-3PO's mind. There was also another thought, the thought of after all this was over, what was going to be his new life? Or would his master come to his aid as he wished on the first day he and C-3PO ended up on the planet?
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C-3PO took an interest in the stained glass windows in the hallway leading to the throne room. They were the only sources of light in the entire hallway. The colorful windows of glass depicted the land's most historical moments and influential figures. The protocol droid had his eyes mainly on the largest stained glass window in the hallway.

This stained glass window depicts Princess Twilight Sparkle, in the middle. The purple baby dragon at her side. And around her, the same ponies that accompanied Twilight when they escaped the invasion of Canterlot.

Surprisingly, it wasn't the detail that caught C-3PO's attention. It was the significance that the window conveyed. These seven colorful beings weren't just friends, they were heroes. Heroes who defeated many evils that threaten their land. It was their unity that made them strong. It was their unity that made them gather the strength to make the long and dangerous journey to find help to liberate their home.

Twilight's words play back in C-3PO's mind. C-3PO had made his choice by joining the Storm King, unaware of his malicious intentions at first. To the outside world, he was the enemy. He was feared.

C-3PO never wanted to live by that persona.
Then came the thought of: What if Twilight was right? What if he, C-3PO, could stand up to his corrupted master? To call him out on his wrong doings.