HK-51: The Droid Assassin of Equestria

Charming Thunder was readying the shuttle for transportation to the Crystal Empire. The Cutie Mark Crusaders were the last ponies to arrive to the group. He then exited the ship and saw the whole group waiting for him. "You girls ready?" he asked to the group. Everyone nodded and entered the shuttle in a single file line and went to find their seats.

The voice terminal then started to talk about the safety procedures of flight, "For your safety, please fasten your seat belts and keep your personal belongings under your seats while on board the Lambda class Imperial shuttle. Thank you and have a pleasant flight." Once the instructions ended, Charming Thunder started the engines and began the lift off sequence. The doors above the ship started to open as the shuttle slowly floated off the ground. Once it was outside of the hangar, its wings then started to fold down and it began to push forward to the direction to where the Crystal Empire is.

Everyone but the Crusaders and Charming Thunder were fast asleep during the flight. A spark was seen in front of him and he said, "Everypony wake up. We're here." They then started to wake up and rub their eyes and there they saw the Crystal Empire's tower the place were the princess stays. Charming Thunder then saw a great spot to land and headed there. The wings started to fold up like a butterfly and the ship has finally touched down to the ground. Everyone then unfastened their seat belts and exited the ship. They then started to walk to the castle and see what Princess Cadence's discovery was.

"It feels great to be back at the Crystal kingdom," Rarity said.

"You have been here before?" Charming Thunder asked.

"Of course. We came here to stop an evil dark king named Sombra from taking over this kingdom and set up the Crystal fair." She then pointed to the crystal heart that is in front of the castle floating. "Our friend Spike was the one who brought back the crystal heart and it destroyed King Sombra for good."

"Do you think that he might return, Twilight?"

"No," Twilight said. The conversation ended when they all arrived at the castle doors. The doors then opened and it revealed Princess Cadence waiting for them.

"Charming Thunder," Cadence said excitedly.

"Cadence!" He then shared a hug with her to show how much he missed his best sister. "I have missed you so much."

"I missed you, too."

"How's Shining Armor?"

"He's fine. He is with the royal guards protecting this kingdom. How are things back at Ponyville?"

"Ponyville has been awesome now that I am with Twilight. I met new ponies while I was there."

"So whats the situation?" Rainbow Dash asked.

"One of the Crystal ponies was hiking at the mountains and discovered something in the cave. I just can remember what she said it looked like but all she told me that it was a robot. I have her here with me right now so that she can explain what it is." Everyone then started walking to the room where the Crystal pony is so that they can figure out what she discovered and start their investigation in the mountains to see the robot in person and see if it is friendly or not.