Earth -34
China

In the Valley of Peace was a battle going on. Many lives were lost. What was happening was the Wu Sisters had rallied up all the criminals, bandits, and thieves to march on the Valley and take what they wanted. All Kung Fu Masters were all called to the Valley to help. In a corner was a bunch of bandits beating up an old bird. That bird was Mr. Ping, Po's adopted father. Who was later found on the ground dead by Po, who had him in his arms sobbing his eyes out. The battle was won, but with a heavy cost of many lives. Unfortunately the Wu Sisters escaped. 2 days later was a funeral held for Mr. Ping, all Kung Fu Masters, pandas, and costumers of Ping's came. Po was now looking out on the balcony with his head held down in pain and sadness. All he felt was a empty void in his heart. It was as if the happiness and joy in his heart was drained away.

"Po..."

Po turns around to see Li Shan, Fung, Shifu, Blade and Tigress.

"Are you okay?" Tigress asked.

"Not really." Po said darkly looking at the sun setting down.

"Look Po... it's not your fault. We were all fighting and none of us could've known he was under attack." Blade said.

"I'm not blaming anyone but the ones who took him from me." Po said as gripped the rails hard.

"Don't worry. We'll find the Wu Sisters and they will be punished." Tigress said.

"Punishment isn't enough. They need to be eliminated! Be stopped! For good." Po said.

"Po, this isn't you. The Dragon Warrior doesn't kill. He defends and protects." Shifu said.

"Well, perhaps it's time to do more then that." Po said.

"I've lost my brother. I know what it's like losing someone you love." Blade said.

"Look son, I know I wasn't there for you and he was the one who raised you, but at least you still have me." Li Shan said trying to comfort his son.

"Look, we're going to join the others for the wake, I hope you'll join us." Li said as they all go with Fung being the last one.

"Fung wait!" Po said without looking at him.

"What is it?" Fung asked. The two of them have been the best of friends to each other ever since Fung went straight. Fung started to see Po as brother who helped him see what was right and wrong.

"You were once a criminal. Surely, you must have friends who were criminals as well, right?" Po asked.

"Yeah... why?" Fung asked nervously.

"If they're still friends to you... then perhaps they can help me find the Wu Sisters." Po said.

"Yeah... I'm sure they can help." Fung said starting to see what Po was planning.

"That way, I can catch the Wu Sisters." Po said starting to growl.

"Okay, but you're not going to go crazy, right?" Fung asked.

"I must have my revenge on those who killed my dad." Po said. Fung was seeing Po was giving in to his anger.

"Whoa, take it easy, Po. You're not a killer. Don't become one." Fung advised.

"I can't do this without you, Fung. You're my best friend. I... I need you. My brother." Po said.

Hearing that made Fung want to help him. Plus, he would be able to keep an eye on him. To make sure Po doesn't do anything... reckless.

"Okay. Just as long as you keep it cool." Fung said. Po nodded.

Soon they went to see one of Fung's old crime friends who were able to tell them of where the Wu Sisters were. They were now planning an attack on the Jade Palace for ruining their plans. He bursted into their room with criminals there who he easily defeated. The Wu Sisters saw him quite pissed off.

"Well, well, well... if it isn't the Dragon Master. How are you doing?" Su Wu said. Po then charged in battle attacking the Wu Sisters. Fung and Gahri see this and fight their way to Po. They continued to fight as they look up to see Po fighting the Wu Sisters.

As Po fought with his chi power, the golden-yellow energy started to turn into a dark green energy. He continues to do rapid punches at the Wu Sisters, until they couldn't get back up. He then delivers one final blow, knocking them down. He then pulls out his Sword of Heroes, ready to end them. Fung saw this and immediately rushes up to stop him.

"Po, NOOO!" Fung yells out hoping to stop him, but Po brought down the sword, killing the 3 Wu Sisters. He breathes heavily as he completed his mission. Fung runs up and sees what Po did in horror.

"What... did... you do?" Fung asked looking at what he did.

"What I had to do." Po said as he pushes Fung aside.

"Okay! So we're done! You had your revenge so let's go home." Fung said.

"No." Po answered.

"What? Why?" Fung asked.

"Ending the Wu Sisters isn't enough. I need to end all criminals. To make everyone safe." Po said.

"Are you crazy?! Look at what you've done already. Po, this isn't you. You're not a killer. The Dragon Master doesn't kill." Fung said pleading for Po to stop.

"Well, maybe I don't want to be Dragon Master. That weak side of me won't hold me back anymore!" Po said as he heads off. Fung saw this and knew his brother was gone.

Po was no longer the Dragon Master. He was tired of being the Dragon Master. He wanted to be something more. Something of darkness. And that's when he became... The Dragon Slayer!

Pretty soon, criminals, villains, and bandits around China were all killed. All the Kung Fu Masters rallied together to stop Po, but it wasn't enough. He killed each and every one that stood in his way. The only ones Masters who remained were Master Fox, Master Ox, Master Croc, Master Komodo, Master Wolf, the Furious Five, Sir Blade, Sir Colin, Fung. Po soon wiped them all out easily with dark power. Soon only Shifu, Tigress, Blade, Colin, Fung and Li Shan remains.

Po stood before them, glaring at them with hate. He couldn't understand why they won't side with him when he was trying to protect them.

"Po... you have to stop this!" Shifu said.

"For the last time... I am trying... TO SAVE EVERYONE! Don't you understand?! I'm cleaning this world of it's evil!" Po shots as he unleashed a blast of dark negative chi at them.

"You're not saving it, you're destroying it!" Tigress said as she tries to stop him, but he was too powerful. He smashes her across the room, ending up outside the palace.

"Po! Stop! This isn't who are! The Dragon Master is not a murderer!" Shifu said trying to stop Po.

"The old Po is dead! I destroyed him." Dragon Slayer said as he continues to throw hard attacks at Shifu which becomes too much for Shifu. Po sees a opening and then stabs him, ending him. The Great Master Shifu was no more.

"This must stop now! Dragon Master!" Colin said with Blade by his side.

"It's Dragon Slayer!" Po shouts as they fight. Being a knight has its advantages but Po had power which use

As Blade try to stop him by engaging it sword combat. Colin aims his gun at Po trying to get a clear shot.

"Sorry Po." Colin said aiming his gun at Po. He fires at him, Po hears the blast, and blocks it away from him, only to hit his dad, Li Shan instead.

"Po..." Li sputtered as he collapsed. Po then saw what happened in horror as his birth father was killed.

"DAD!!!" Po shouts as he rushes to him. Colin couldn't believe what just happened. He didn't mean to do that.

"No... what have I done." Colin said regretting what he did. Now growing more angry, Po fired a full blast of Dark Chi at Colin, killing him instantly.

"Colin!" Blade shouts. She saw him dead and rushes to end Po, but he grabs her blade and smashes it to pieces and stabs her with the broken blade.

Tigress sees what happened and rushes to finish him by cracking the pillar to fall on him but Fung pushes Po out of the way only to get crushed.

"Fung!" Po shouts. He then drains Tigress of her life force, killing her and rushes to pull Fung out of the rubble. He sees Fung bruised badly, bleeding badly on his side. He then tries to heal him with his chi but Fung stops him.

"No! Don't... please." Fung wheezed.

"But I can save you!" Po said.

"Even in our world... (coughs) death is part of the plan." Fung said.

"I can't accept that." Po said trying to help Fung.

"I know, I know. I can only hope you'll understand sooner or later." Fung said as he said his final words before dying. Po looks around to see what he done, all of his friends, his family... gone.

"At last... peace." Po said looking all around. He wished Fung was still alive, same with his father and friends but they stood against him. There was some pity in his heart for what he did but it had to be done. But then cutting him off his thought, the sky turned red and red lightning started crashed down on the land. His world was coming apart and there was nothing he could do to stop it.

"Everything I've done... it was all for nothing." Dragon Slayer said as he watched his Earth crumble.

"Or is it?"

Dragon Slayer turns around to see a strange man dressed in black suit with a wicked smile on his face.

"Who the hell are you?" Po asked.

"Haha, call me the Batman Who Laughs. Quiet the show you put on. How ironic, you set out on a mission to protect your family and friends only to kill them as well. It's kinda funny to me." The Batman Who Laughs cackled a bit.

"Why are you here? I've never seen someone who looks like you." Dragon Slayer said.

"That's because I'm not from this world born in the darkness. Unfair is it? Worlds like ours are only meant to die." The Batman Who Laughs said.

"So it didn't matter what I did, I was going to die soon." Dragon Slayer said thinking about what he did.

"But you don't have to! My master is recruiting others just like us to help take over the center of Light Multiverse. What if I told you that on that world is your father still alive? Obey my master and he'll give you your dad back." The Batman Who Laughs said.

Po thought about it. This could be his chance to be with his dad. He had to do this. Anything to see him alive again.

"Take me there." Dragon Slayer said.